Apps

Website Speed Test

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Speed Audit

Lighthouse audit of one page: score, lab performance metrics, and the top fixes with estimated savings.

Usually finishes within two minutes.

Page URL

Device profile (optional)

MobileDesktop

Lighthouse categories (optional)

PerformanceAccessibilityBest practicesSEO

1 choice · at least 1

Full (optional)

Include the full Lighthouse JSON report in this response (default false); the complete report is always saved to reportPath

Speed Audit

Changes from the previous run

Field	Previous	Current

Raw JSON

Speed Compare

Race 2-5 pages on the same device profile and rank them fastest first.

Usually finishes within two minutes.

Page URLs

2 values · 2–5

1https://example.com
2https://www.wikipedia.org

Paste multiple values

Device profile (optional)

MobileDesktop

Full (optional)

Include each successful URL's full Lighthouse JSON report in this response (default false); complete reports are always saved to each entry's reportPath

Speed Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

SSL Certificate Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

SSL Check

Probe one host's TLS protocol support and the certificate it serves.

Usually finishes within 30 seconds.

Website URL

Only the host and port are probed: the page itself is not fetched.

SSL Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Tracker Checkup

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Privacy Scan

Visit one site in an instrumented browser and reveal its observed tracking surface.

Usually finishes within two minutes.

Website URL

Device profile (optional)

DesktopMobile

Privacy Scan

Changes from the previous run

Field	Previous	Current

Raw JSON

Privacy Compare

Scan two to four sites and rank them from lowest to highest observed tracking surface.

Usually finishes within two minutes.

Website URLs

2 values · 2–4

1https://example.com
2https://www.w3.org

Paste multiple values

Device profile (optional)

DesktopMobile

Privacy Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

E-Invoice Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Check

Validate one public-sample, synthetic, or safely redacted EU e-invoice against EN 16931 and Schematron rules, with exact rule IDs.

Usually finishes in a few seconds; a large invoice can take up to two minutes.

Invoice source

Use Invoice URLPaste Invoice XML

Only the active source is sent. You can switch without losing what you entered.

Invoice URL

Public sample/test invoice XML only. For ZUGFeRD or Factur-X, link the embedded CII XML.

Validate against (optional)

XRechnungPeppol BISEN 16931Auto-detect

Auto-detect reads the profile declared inside the invoice.

Findings kept (optional)

Allowed range: 1–1000 · whole numbers

Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Compare

Validate two invoices of the same syntax and profile, then rank which conformance findings changed.

Usually finishes in about ten seconds; two large invoices can take up to two minutes.

Invoices to compare

Add exactly two invoices total, baseline first. When you mix a URL and a paste, the URL is the baseline.

Invoice URLs (optional)

2 values · up to 2

1https://sfti.se/download/18.9732b6e19afcee6c3e1715/1765197153856/BIS_Billing_30-Telefoni.xml
2https://sfti.se/download/18.9732b6e19afcee6c3e1722/1765197175690/BIS_Billing_30-Telefoni2.xml

Paste multiple values

The first invoice is the baseline; the second is compared against it.

Pasted invoice XML (optional)

0 values · up to 2

Synthetic, public-sample, or safely redacted XML only. Never paste real production invoices or real party, tax, customer, payment, or banking data.

Validate against (optional)

XRechnungPeppol BISEN 16931Auto-detect

Auto-detect reads the profile declared inside each invoice.

Findings kept per invoice (optional)

Allowed range: 1–600 · whole numbers

Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

Web Accessibility Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

WCAG

Automated accessibility scan of one live page with separate WCAG-tagged and best-practice findings.

Usually finishes in 3 to 7 seconds.

Page URL

WCAG

Changes from the previous run

Field	Previous	Current

Raw JSON

CSAF Advisory Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Advisory Check

Validate one public CSAF 2.0 advisory against the official schema and conformance tests.

Usually finishes within 30 seconds.

Advisory URL

A direct link to the advisory JSON, publicly fetchable, up to 5 MB.

83 of 2048

Conformance target (optional)

BasicExtendedFull

Basic runs the schema and mandatory tests; Extended adds optional; Full adds informative.

Findings to list (optional)

Allowed range: 1–1000 · whole numbers

Most severe first.

Advisory Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Compare

Validate two public CSAF 2.0 advisories under identical limits and show which conformance failures differ.

Usually finishes within 30 seconds.

Advisory URLs

2 values · exactly 2

1https://security.access.redhat.com/data/csaf/v2/advisories/2024/rhsa-2024_0001.json
2https://security.access.redhat.com/data/csaf/v2/advisories/2024/rhsa-2024_0002.json

Paste multiple values

The first is the baseline; the second is the candidate.

Conformance target (optional)

BasicExtendedFull

Basic runs the schema and mandatory tests; Extended adds optional; Full adds informative.

Findings to list (optional)

Allowed range: 1–500 · whole numbers

Most severe first, per advisory.

Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

Provider Scan

Validate a vendor's most recent published advisories and count how many are conformant.

Usually finishes within 30 seconds.

Provider

A domain, or any URL ending in provider-metadata.json.

70 of 2048

Advisories to validate (optional)

Allowed range: 1–20 · whole numbers

The most recent first.

Conformance target (optional)

BasicExtendedFull

Basic runs the schema and mandatory tests; Extended adds optional; Full adds informative.

Provider Scan

Changes from the previous run

Field	Previous	Current

Raw JSON

FHIR Conformance Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Check

Validate one public FHIR R4 resource or IG example against its declared US Core / IPS profile.

Usually takes 30 to 60 seconds and can take up to 110 seconds; the validator loads its profile packages on every run.

Choose input source

Use Resource URLPaste FHIR JSON

Only the active source is sent. You can switch without losing what you entered.

Resource URL

Public samples, IG examples, or deidentified technical resources only. Never submit identifiable patient records. Fetched without authentication.

Profile override (optional)

Optional: force a target profile. Leave empty to use the resource's own meta.profile.

Maximum issues (optional)

Allowed range: 1–1000 · whole numbers

Most severe first. Leave empty for 400.

Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Compare

Compare diagnostics for two same-profile resources; an unavailable run or profile mismatch makes the comparison inconclusive.

Comparison can take up to 110 seconds; different implementation-guide versions need separate validator runs.

Input A source

Use Baseline resource URLPaste Baseline FHIR JSON

Only the active source is sent. You can switch without losing what you entered.

Input B source

Use Revised resource URLPaste Revised FHIR JSON

Only the active source is sent. You can switch without losing what you entered.

Baseline resource URL

Public samples, IG examples, or deidentified technical resources only. Never submit identifiable patient records.

Revised resource URL

Both must be public samples, IG examples, or deidentified technical resources under the same profile canonical. Never submit identifiable patient records.

Maximum issues per resource (optional)

Allowed range: 1–600 · whole numbers

Most severe first. Leave empty for 300.

Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

Mobile Site Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Mobile Check

Render one page across four phone and tablet profiles and grade its mobile layout.

Usually finishes within two minutes.

Page URL

Mobile Check

Changes from the previous run

Field	Previous	Current

Raw JSON

PDF Checkup

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

PDF check

Validate one public PDF against an explicit PDF/A, PDF/UA, or WTPDF profile.

Usually finishes in a few seconds; slow origins can take up to 110 seconds.

PDF URL

PDF profile

PDF check

Changes from the previous run

Field	Previous	Current

Raw JSON

PDF compare

Compare two or three PDF revisions against the same profile and rank them by conformance.

Checks the revisions one after the other; usually under 15 seconds, up to 110 seconds.

PDF revisions

2 values · 2–3

1https://www.ietf.org/archive/id/draft-akiya-bfd-seamless-ip-00.pdf
2https://www.ietf.org/archive/id/draft-akiya-bfd-seamless-ip-01.pdf

Paste multiple values

Two revisions of one document: baseline first, revised second

PDF profile

PDF compare

Changes from the previous run

Field	Previous	Current

Raw JSON

Audio Master Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Release Check

Decode one audio master and grade its loudness, true peak, dynamics, and silence.

Usually finishes in a few seconds; a large lossless master can take up to 110 seconds.

Audio source

Use Audio file URLUpload Audio file

Only the active source is sent. You can switch without losing what you entered.

Audio file URL

Direct link to one MP3, WAV, FLAC, AAC, M4A, OGG, or Opus file, not a streaming page.

Content profile (optional)

MusicPodcastBroadcast

Sets which release conventions the findings are compared against.

Release Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Track Compare

Measure two to four release tracks and check loudness and format consistency across them.

Two small tracks finish in a few seconds; four large tracks can take up to 110 seconds.

Track sources

Use Track URLsUpload Audio files

Only the active source is sent. You can switch without losing what you entered.

Track URLs

2 values · 2–4

1https://archive.org/download/musopen-chopin/WaltzB.21InAFlatMajor.mp3
2https://archive.org/download/musopen-chopin/WaltzB.46InEFlatMajor.mp3

Paste multiple values

Tracks from the same release, or alternate masters of one track.

Content profile (optional)

MusicPodcastBroadcast

Sets which release conventions the findings are compared against.

Track Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

JS Vulnerability Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

JS scan

Scan the external scripts present in a page's served HTML for library versions with known published vulnerabilities.

Usually finishes in a few seconds; a page with many large scripts can take up to two minutes.

Page URL

JS scan

Changes from the previous run

Field	Previous	Current

Raw JSON

SBOM Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

SBOM Check

Validate one public SBOM with PURL and SPDX-license-id checks, plus full versioned-schema validation for JSON documents.

Usually finishes within 30 seconds.

Choose input source

Use SBOM URLUpload SBOM file

Only the active source is sent. You can switch without losing what you entered.

SBOM URL

135 of 2048

Findings per category (optional)

Allowed range: 1–1000 · whole numbers

SBOM Check

Changes from the previous run

Field	Previous	Current

Raw JSON

SBOM Compare

Compare two builds' SBOMs for machine-checkable defects and drift.

Usually finishes within 30 seconds.

Choose input source

Use SBOM URLsUpload SBOM files

Only the active source is sent. You can switch without losing what you entered.

SBOM URLs

2 values · exactly 2

1https://github.com/CycloneDX/bom-examples/raw/7d9172d00c88c05a8f1ccb90589d111870fc9d86/SBOM/proton-bridge/proton-bridge-v1.6.3.bom.json
2https://github.com/CycloneDX/bom-examples/raw/7d9172d00c88c05a8f1ccb90589d111870fc9d86/SBOM/proton-bridge/proton-bridge-v1.8.0.bom.json

Paste multiple values

Findings per category (optional)

Allowed range: 1–500 · whole numbers

SBOM Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

Security Headers Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Header Check

Report which of the eight browser protection headers a page sends, with the values and a weighted header score.

Usually finishes within 30 seconds.

Page URL

Header Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Broken Link Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Link Check

Check up to 100 unique link and image targets on one page and list failures with their status code, network error, or timeout.

Usually finishes within 30 seconds.

Page URL

Only this page's links and images are checked, not the rest of the site.

Link Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Caption File Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Caption Check

Validate one WebVTT, SRT, or TTML caption file for spec conformance, cue timing, encoding, and reading speed.

Usually finishes in a few seconds; a full-length track can take up to a minute.

Caption source

Use Caption URLUpload Caption file

Only the active source is sent. You can switch without losing what you entered.

Caption URL

Up to 2 MB, format detected from the contents.

78 of 2048

Reading-speed profile (optional)

Netflix adultNetflix childrenYouTubeEBU-TT

Netflix publishes 20 and 17 CPS caps; YouTube and EBU-TT are advisory at 17 CPS.

Caption Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Caption Compare

Align two caption tracks and flag cue-count and timing drift under identical limits.

Usually finishes in a few seconds; two full-length tracks can take up to a minute.

Caption sources

Use Caption URLsUpload Caption files

Only the active source is sent. You can switch without losing what you entered.

Caption URLs

2 values · exactly 2

1https://www.w3.org/WAI/wai-videos/video-introduction/video-introduction.en.vtt
2https://www.w3.org/WAI/wai-videos/video-introduction/video-introduction.fr.vtt

Paste multiple values

Exactly two, baseline first; each up to 2 MB.

Reading-speed profile (optional)

Netflix adultNetflix childrenYouTubeEBU-TT

Netflix publishes 20 and 17 CPS caps; YouTube and EBU-TT are advisory at 17 CPS.

Caption Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

Ebook Accessibility Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

WCAG Check

DAISY Ace run on one EPUB: the pass verdict, WCAG violations by success criterion, and the accessibility metadata state.

Usually finishes within two minutes.

EPUB source

Use EPUB URLUpload EPUB file

Only the active source is sent. You can switch without losing what you entered.

EPUB URL

Direct link to the .epub bytes; a large book can take about 90 seconds

Max violations (optional)

Allowed range: 1–1000 · whole numbers

Most severe first

WCAG Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Build Comparison

Evaluate proposed baseline and revised builds; diff and rank only when package metadata establishes the same publication lineage.

Usually finishes within two minutes.

Build sources

Use EPUB URLsUpload EPUB files

Only the active source is sent. You can switch without losing what you entered.

EPUB URLs

2 values · exactly 2

1https://github.com/IDPF/epub3-samples/releases/download/20230704/haruko-jpeg.epub
2https://github.com/IDPF/epub3-samples/releases/download/20230704/haruko-html-jpeg.epub

Paste multiple values

Proposed baseline first, revision second. The tool checks publication metadata and declines cross-book diff claims.

Max violations (optional)

Allowed range: 1–600 · whole numbers

Per build, most severe first

Build Comparison

Changes from the previous run

Field	Previous	Current

Raw JSON

Ebook File Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Spec Check

EPUBCheck run on one EPUB: the pass verdict, findings with rule id and file location, and the structural inventory.

Downloading and validating the EPUB can take up to 110 seconds.

EPUB source

Use EPUB URLUpload EPUB file

Only the active source is sent. You can switch without losing what you entered.

EPUB URL

Direct link to the .epub bytes, not a viewer or share page

Max findings (optional)

Allowed range: 1–500 · whole numbers

Most severe first

Spec Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Build Compare

Two builds of one book, baseline first: which spec rules regressed and which were fixed.

Both builds run sequentially under one shared deadline of up to 110 seconds.

Build sources

Use EPUB URLsUpload EPUB files

Only the active source is sent. You can switch without losing what you entered.

EPUB URLs

2 values · exactly 2

1https://github.com/IDPF/epub3-samples/releases/download/20230704/cole-voyage-of-life.epub
2https://github.com/IDPF/epub3-samples/releases/download/20230704/cole-voyage-of-life-tol.epub

Paste multiple values

Two builds of one book: baseline first, revised second

Max findings (optional)

Allowed range: 1–300 · whole numbers

Per build, most severe first

Build Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

npm Package Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Package Check

Full preflight of one npm package: grade, tarball contents, install scripts, suspicious files, integrity, provenance presence, licensing, and release health.

Usually finishes within 30 seconds.

Package

Public npm package; bare names resolve to the latest version

14 of 230

Package Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Compare specs

Grade two to five packages or versions side by side and rank them with a recommendation.

Usually finishes within 30 seconds.

Packages

2 values · 2–5

1ms@2.1.2
2ms@2.1.3

Paste multiple values

Two to five specs, one per line or JSON array

Compare specs

Changes from the previous run

Field	Previous	Current

Raw JSON

Site SEO Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

SEO Check

Lighthouse SEO plus a 13-point discoverability checklist.

Usually finishes within two minutes.

Page URL

Full (optional)

Include the full Lighthouse SEO JSON report in this response (default false); the complete report is always saved to lighthouseReportPath

SEO Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Ads.txt Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Domain check

Validate one domain's ads.txt and app-ads.txt, then cross-check sellers.json reciprocity.

The bounded sellers.json crawl and file checks can take up to 110 seconds.

Publisher domain

A full page URL works: only its host is used.

15 of 2048

Cross-check sellers.json

Confirms declared seller IDs appear in the sellers.json of each ad system crawled.

Sellers.json hosts to crawl (optional)

Allowed range: 0–10 · whole numbers

0 skips the reciprocity crawl.

Domain check

Changes from the previous run

Field	Previous	Current

Raw JSON

Domain compare

Diff the authorized-seller sets of two domains under identical limits.

Both domains are checked under one shared call deadline of up to 110 seconds.

Domains to compare

2 values · exactly 2

1vox.com
2eater.com

Paste multiple values

Cross-check sellers.json

Confirms declared seller IDs appear in the sellers.json of each ad system crawled.

Sellers.json hosts per domain (optional)

Allowed range: 0–10 · whole numbers

0 skips the reciprocity crawl.

Domain compare

Changes from the previous run

Field	Previous	Current

Raw JSON

Auth Discovery Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Issuer check

Validate one issuer's discovery document, its JWKS, and the endpoints it references.

Usually finishes within 30 seconds.

Issuer or metadata URL

An issuer origin, a full .well-known metadata URL, or a remote MCP server base URL

27 of 2048

Document family (optional)

Leave this unset to detect the family from the URL and the document itself

Probe the referenced endpoints

Clear this to list the referenced endpoints without checking whether they respond

Issuer check

Changes from the previous run

Field	Previous	Current

Raw JSON

Comparison

Run the same checks on two issuers and report what differs between their documents.

Usually finishes within 30 seconds.

Two issuer or metadata URLs

2 values · exactly 2

1https://accounts.google.com
2https://appleid.apple.com

Paste multiple values

Both must resolve to the same document family to be comparable, for example two OpenID Connect issuers

Document family (optional)

Leave this unset to detect the family from each URL and document

Probe the referenced endpoints

Clear this to list the referenced endpoints without checking whether they respond

Comparison

Changes from the previous run

Field	Previous	Current

Raw JSON

netCDF CF Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Check

Validate one hosted netCDF file against the CF Metadata Conventions with per-check evidence.

Usually finishes in a few seconds; a large file can take up to 110 seconds.

netCDF URL

Conformance suites (optional)

CF ConventionsACDDIOOS

1 choice · 1–3

Pass criteria (optional)

LenientNormalStrict

Finding limit (optional)

Allowed range: 1–1000 · whole numbers

Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Compare

Compare two revisions of one netCDF dataset and report CF regressions and resolved checks.

Usually finishes in a few seconds; two large files can take up to 110 seconds.

Revision URLs

2 values · exactly 2

1https://raw.githubusercontent.com/pydata/xarray-data/e12f356a966cfef536ef9e731bde60c392767f08/ncep_temperature_north-america_2013-14.nc
2https://raw.githubusercontent.com/pydata/xarray-data/2baf0c22d9671a2058415f17e71b3fe06239a3dd/air_temperature.nc

Paste multiple values

Exactly two revisions of one dataset: baseline first, revised second.

Conformance suites (optional)

CF ConventionsACDDIOOS

1 choice · 1–3

Pass criteria (optional)

LenientNormalStrict

Findings per file (optional)

Allowed range: 1–600 · whole numbers

Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

Web App Manifest Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Manifest Check

Validate one page's web app manifest, installability, and real icon evidence.

Usually finishes in 3 to 7 seconds.

Page or manifest URL

27 of 2048

Manifest Check

Changes from the previous run

Field	Previous	Current

Raw JSON

PWA diff

Compare baseline and revised PWA manifests under identical limits.

Usually finishes in 3 to 7 seconds.

Baseline and revised URLs

2 values · exactly 2

1https://www.pwabuilder.com/
2https://preview.pwabuilder.com/

Paste multiple values

Add the baseline first, then the revised deploy.

PWA diff

Changes from the previous run

Field	Previous	Current

Raw JSON

Adaptive Stream Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Stream Check

Validate one HLS or DASH stream with real manifest, rendition, and sampled-segment evidence.

Most checks finish in a few seconds. Large ladders on slow origins take up to 110 seconds.

Manifest URL

Public HLS (.m3u8) or DASH (.mpd) manifest.

Segments to sample (optional)

Allowed range: 0–2 · whole numbers

Downloaded and probed per rendition. 0 skips media sampling.

Recheck live streams

Refetches a live playlist once to confirm it advances. VOD streams are unaffected.

Stream Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Stream Compare

Check two HLS or DASH deployments under identical limits and name the healthier one.

Most comparisons finish in a few seconds. Two large ladders on slow origins take up to 110 seconds.

Manifest URLs

2 values · exactly 2

1https://test-streams.mux.dev/tos_ismc/main.m3u8
2https://dash.akamaized.net/dash264/TestCases/4b/qualcomm/1/ED_OnDemand_5SecSeg_Subtitles.mpd

Paste multiple values

Public HLS (.m3u8) or DASH (.mpd) manifests. The first one is stream A.

Segments to sample (optional)

Allowed range: 0–1 · whole numbers

Downloaded and probed per rendition on each stream. 0 skips media sampling.

Stream Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

Deep Link Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Domain check

Preflight one domain's universal-link and App-Links config across every well-known endpoint.

Usually finishes within 30 seconds.

Domain or site URL

Enter the host: the well-known paths and Apple's CDN copy are derived from it.

17 of 2048

Domain check

Changes from the previous run

Field	Previous	Current

Raw JSON

Domain compare

Compare two domains' deep-link config side by side under identical limits.

Usually finishes within 30 seconds.

Two domains or URLs

2 values · exactly 2

1wikipedia.org
2www.wikipedia.org

Paste multiple values

Compare related hosts: apex against www, or staging against production.

Domain compare

Changes from the previous run

Field	Previous	Current

Raw JSON

FHIR Server Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

FHIR Check

Read a public FHIR server's CapabilityStatement and SMART discovery document and check what it declares.

Usually finishes in 20 to 60 seconds.

Choose the server address to use

Use FHIR base URLUse /metadata URL

Only the active source is sent. You can switch without losing what you entered.

FHIR base URL

Public no-auth base URL; /metadata and .well-known/smart-configuration are both read from it

Raw issue cap (optional)

Allowed range: 1–1000 · whole numbers

The distinct-finding counts cover every issue.

FHIR Check

Changes from the previous run

Field	Previous	Current

Raw JSON

JATS Article Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Article check

Validate one JATS XML article against JATS4R rules and see exact rule-code evidence.

Usually finishes in a few seconds; a large article can take up to 110 seconds.

JATS article

Use Article XML URLPaste JATS XML

Only the active source is sent. You can switch without losing what you entered.

Article XML URL

Public JATS XML with no login.

Maximum findings (optional)

Allowed range: 1–1000 · whole numbers

Most severe first. Left empty, up to 400 are returned.

Article check

Changes from the previous run

Field	Previous	Current

Raw JSON

Article compare

Compare two versions of the same JATS article and see regressed and resolved JATS4R findings.

Validates the two articles in order: usually 10 to 30 seconds, up to 115 seconds for large articles.

Baseline article

Use Baseline XML URLPaste Baseline JATS XML

Only the active source is sent. You can switch without losing what you entered.

Revised article

Use Revised XML URLPaste Revised JATS XML

Only the active source is sent. You can switch without losing what you entered.

Baseline XML URL

First version. It must share an article identifier with the revised version.

Revised XML URL

Second version. It must share an article identifier with the baseline.

Maximum findings per article (optional)

Allowed range: 1–600 · whole numbers

Most severe first. Left empty, up to 300 per article are returned.

Article compare

Changes from the previous run

Field	Previous	Current

Raw JSON

NeTEx Dataset Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Dataset check

Validate one hosted NeTEx dataset against the CEN schema and Entur's Nordic profile validation tree.

The sample usually finishes within a minute. Large exports can take up to 110 seconds.

Dataset URL

Findings limit (optional)

Allowed range: 1–1000 · whole numbers

Dataset check

Changes from the previous run

Field	Previous	Current

Raw JSON

Dataset compare

Compare two same-lineage NeTEx datasets and report conformance regressions.

The sample usually finishes within a minute. Large pairs can take up to 115 seconds.

Baseline and revised URLs

2 values · exactly 2

1https://cdn.jsdelivr.net/gh/entur/netex-validator-java@v12.0.0/src/test/resources/rb_flb-aggregated-netex.zip
2https://cdn.jsdelivr.net/gh/entur/netex-validator-java@v12.0.0/src/test/resources/rb_flb-aggregated-netex-invalid-reference.zip

Paste multiple values

Baseline first, revised second.

Findings limit (optional)

Allowed range: 1–600 · whole numbers

Dataset compare

Changes from the previous run

Field	Previous	Current

Raw JSON

Product Feed Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Feed Check

Preflight one product feed with format, coverage, identifier, and sampled-URL evidence.

The default finishes in under a second. Live URL sampling and slow feeds can take up to 60 seconds.

Feed URL

Public XML, CSV, TSV, or gzip feed. No sign-in or custom headers.

41 of 2048

Links and images to sample (optional)

Allowed range: 0–20 · whole numbers

Checks up to this many product links and primary images. Use 0 to skip.

Feed Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Feed Compare

Compare two product feeds under identical limits and see which has fewer measured issues.

The default finishes in under a second. Two slow feeds with live URL sampling can take up to 60 seconds.

Feed URLs

2 values · exactly 2

1https://novelspell.com/merchant/en-US.xml
2https://novelspell.com/merchant/fr-FR.xml

Paste multiple values

Links and images per feed (optional)

Allowed range: 0–10 · whole numbers

Checks up to this many product links and primary images per feed. Use 0 to skip.

Feed Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

Webpage HTML Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

HTML Check

Standards validation of one page's markup against the html-validate recommended ruleset.

Usually finishes within 30 seconds.

Page URL

HTML Check

Changes from the previous run

Field	Previous	Current

Raw JSON

3D Asset Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Asset check

Run the official Khronos validator on one glTF or GLB asset, then measure its geometry, textures, and transfer weight.

Small assets finish in seconds. Large ones can take up to 100 seconds.

Asset URL

Direct file link ending in .gltf or .glb

Asset check

Changes from the previous run

Field	Previous	Current

Raw JSON

Asset compare

Validate two to four exports of the same model and rank them best first.

Checks two assets at a time, up to 110 seconds.

Asset URLs

2 values · 2–4

1https://cdn.jsdelivr.net/gh/KhronosGroup/glTF-Sample-Assets@main/Models/Duck/glTF-Binary/Duck.glb
2https://cdn.jsdelivr.net/gh/KhronosGroup/glTF-Sample-Assets@main/Models/Duck/glTF-Embedded/Duck.gltf

Paste multiple values

Exports of the same model, each ending in .gltf or .glb

Asset compare

Changes from the previous run

Field	Previous	Current

Raw JSON

Croissant Dataset Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Check

Validate one hosted or pasted Croissant document with mlcroissant, then probe the files it declares for reachability.

Usually finishes in a few seconds; the reachability probe takes most of that time.

Croissant source

Use Croissant URLUse Croissant JSON-LD

Only the active source is sent. You can switch without losing what you entered.

Croissant URL

A directly hosted public Croissant JSON-LD document.

Check that declared files are reachable

Files to probe (optional)

Allowed range: 1–10 · whole numbers

Left empty, up to 10 declared files are probed with HEAD or range requests.

Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Compare

Validate a baseline and a revised Croissant document for the same dataset, then list which conformance findings appeared or cleared.

Usually finishes in a few seconds; the two documents are validated one after the other.

Croissant sources

Use Croissant URLsUse Croissant JSON-LD documents

Only the active source is sent. You can switch without losing what you entered.

Croissant URLs

2 values · exactly 2

1https://cdn.jsdelivr.net/gh/mlcommons/croissant@v1.0.1/datasets/1.0/gpt-3/metadata.json
2https://cdn.jsdelivr.net/gh/mlcommons/croissant@v1.1.0/datasets/1.0/gpt-3/metadata.json

Paste multiple values

Exactly two hosted documents for the same dataset, baseline first and revised second.

Check that declared files are reachable

Files to probe per document (optional)

Allowed range: 1–10 · whole numbers

Left empty, up to 10 declared files are probed with HEAD or range requests.

Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

Data Catalog Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Catalog check

Validate one hosted DCAT-AP catalog against the official SEMIC SHACL shapes.

Usually finishes in 10 to 30 seconds; a large paged catalog can take up to 90 seconds.

Catalog URL

Public URL of the portal's RDF export in Turtle, RDF/XML, or JSON-LD.

Shapes profile (optional)

Auto-detectDCAT-AP 2.0.1DCAT-AP 3.0.1

Auto-detect reads the graph's own version signal and falls back to 2.0.1, the version the data.europa.eu harvest enforces.

Violations to return (optional)

Allowed range: 1–1000 · whole numbers

Catalog check

Changes from the previous run

Field	Previous	Current

Raw JSON

Catalog compare

Validate two catalogs on one DCAT-AP profile and report which conformance violations regressed or cleared.

Two catalogs run one after the other: usually 30 to 60 seconds, and up to two minutes for large paged catalogs.

Catalog URLs

2 values · exactly 2

1https://data.gov.ie/catalog.ttl
2https://opendata.schleswig-holstein.de/catalog.ttl

Paste multiple values

Baseline catalog first, revised second. Both must be on the same DCAT-AP profile.

Shapes profile (optional)

Auto-detectDCAT-AP 2.0.1DCAT-AP 3.0.1

Auto-detect reads each graph's own version signal and falls back to 2.0.1, the version the data.europa.eu harvest enforces.

Violations to keep per catalog (optional)

Allowed range: 1–600 · whole numbers

Catalog compare

Changes from the previous run

Field	Previous	Current

Raw JSON

Podcast Feed Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Feed Check

Validate one podcast RSS feed against Apple, Spotify, and Podcasting 2.0 readiness with live artwork, enclosure, and media probes.

Usually finishes within one minute.

Feed URL

Recent episodes to inspect (optional)

Allowed range: 1–25 · whole numbers

At most the newest 10 are also probed for delivery.

Sample newest enclosure with ffprobe

Downloads a bounded 2 MB sample and reports ffprobe facts.

Feed Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Episode Check

Diagnose one direct episode media URL: redirects, status, byte-range support, cache headers, and sampled codec facts.

Usually finishes within one minute.

Episode media URL

Episode Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Feed Compare

Compare two feeds side by side (readiness, guids, enclosures, delivery) and name the safer choice for a migration.

Usually finishes within two minutes.

Feed URLs

2 values · exactly 2

1https://www.nasa.gov/feeds/podcasts/houston-we-have-a-podcast
2https://feeds.megaphone.fm/nationalaeronauticsandspaceadministration1776343825

Paste multiple values

One URL per line or JSON array

Recent episodes to inspect per feed (optional)

Allowed range: 1–10 · whole numbers

Feed Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

Product Link Resolver Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Resolver check

Check one live GS1 Digital Link resolver URL against the conformance profile.

Usually finishes in a few seconds. Slow or unresponsive resolvers can take up to 45 seconds.

Resolver URL

49 of 2048

Link targets to probe (optional)

Allowed range: 1–10 · whole numbers

Resolver check

Changes from the previous run

Field	Previous	Current

Raw JSON

Compare

Run identical bounded checks on exactly two resolvers and report what differs.

Usually finishes in a few seconds. Slow or unresponsive resolvers can take up to 90 seconds.

Resolver URLs

2 values · exactly 2

1https://id.gs1.org/01/09506000134376?linkType=all
2https://id.gs1.de/01/04012345999990?linkType=all

Paste multiple values

Link targets to probe (optional)

Allowed range: 1–10 · whole numbers

Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

BIM Model Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

IFC check

Validate one hosted IFC model against the IFC schema and its EXPRESS where-rules, with the buildingSMART normative rules as an option.

A small model takes a few seconds; the buildingSMART normative rules can take up to two minutes.

IFC model source

Use Model URLUse IFC text

Only the active source is sent. You can switch without losing what you entered.

Model URL

A public .ifc (STEP/IFC-SPF) file, up to 50 MB; ifcXML is reported as unsupported

Run buildingSMART normative rules

Slower: a large model can take up to two minutes

Max findings (optional)

Allowed range: 1–1000 · whole numbers

The most severe findings are returned first

IFC check

Changes from the previous run

Field	Previous	Current

Raw JSON

IFC compare

Validate two IFC models on the same schema and see which conformance findings the second model introduced or resolved.

Two small models take a few seconds; the buildingSMART normative rules can take up to two minutes.

Model URLs

2 values · exactly 2

1https://www.steptools.com/docs/stpfiles/ifc/aisc_sculpture_param.ifc
2https://www.steptools.com/docs/stpfiles/ifc/aisc_sculpture_brep.ifc

Paste multiple values

Two public IFC models that declare the same IFC schema: baseline first, revised second

Run buildingSMART normative rules

Slower: a large model can take up to two minutes

Max findings (optional)

Allowed range: 1–600 · whole numbers

The most severe findings are returned first

IFC compare

Changes from the previous run

Field	Previous	Current

Raw JSON

CWL Workflow Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

CWL Check

Validate one CWL document, hosted or pasted, with the reference cwltool engine.

Usually finishes in a few seconds; a multi-file workflow that fetches its references takes longer.

CWL document source

Use CWL document URLPaste CWL document

Only the active source is sent. You can switch without losing what you entered.

CWL document URL

One file, a packed $graph, or a workflow whose relative references sit on the same host.

Maximum findings (optional)

Allowed range: 1–1000 · whole numbers

Most severe first. Left empty, the engine returns up to 400.

CWL Check

Changes from the previous run

Field	Previous	Current

Raw JSON

CWL Compare

Validate a baseline and a revised CWL document, then list the findings that appeared or cleared.

Usually finishes in about five seconds; the two documents are validated one after the other.

Baseline and revised source

Use CWL document URLsPaste CWL documents

Only the active source is sent. You can switch without losing what you entered.

CWL document URLs

2 values · exactly 2

1https://dockstore.org/api/api/ga4gh/v2/tools/quay.io%2Fpancancer%2Fpcawg-bwa-mem-workflow/versions/2.6.8-cwl1/plain-CWL/descriptor/Dockstore.cwl
2https://dockstore.org/api/api/ga4gh/v2/tools/quay.io%2Fpancancer%2Fpcawg-bwa-mem-workflow/versions/2.7.0/plain-CWL/descriptor/Dockstore.cwl

Paste multiple values

Baseline document first, revised second. Both are validated even when their CWL versions differ.

Maximum findings (optional)

Allowed range: 1–600 · whole numbers

Collected per document, most severe first. Left empty, the engine collects up to 300.

CWL Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

STIX Bundle Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Bundle check

Validate one hosted STIX 2.1 bundle or TAXII page with schema, relationship-endpoint, and pattern evidence.

Usually finishes in a few seconds; a multi-megabyte bundle can take up to two minutes.

Bundle source

Use Bundle URLUse TAXII collection URLUse Bundle JSON

Only the active source is sent. You can switch without losing what you entered.

Bundle URL

Check relationship endpoints

Flag custom object types

Flag custom properties

Findings kept per category (optional)

Allowed range: 1–1000 · whole numbers

Bundle check

Changes from the previous run

Field	Previous	Current

Raw JSON

Bundle compare

Compare total conformance finding counts and changes among returned findings for two STIX 2.1 bundles.

Usually finishes in a few seconds; two large bundles can take up to two minutes.

Bundle URLs

2 values · exactly 2

1https://oasis-open.github.io/cti-documentation/examples/example_json/apt1.json
2https://oasis-open.github.io/cti-documentation/examples/example_json/identifying-a-threat-actor-profile.json

Paste multiple values

The first bundle is the baseline; the second is compared against it.

Check relationship endpoints

Flag custom object types

Flag custom properties

Findings kept per bundle (optional)

Allowed range: 1–600 · whole numbers

Bundle compare

Changes from the previous run

Field	Previous	Current

Raw JSON

GTFS Feed Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Feed Check

Validate one public GTFS feed against the spec with exact notice-code evidence.

Usually finishes in a few seconds; a large multi-megabyte feed can take up to 90 seconds.

Feed URL

Direct link to the .zip bytes, not a feed portal page

Notice codes shown (optional)

Allowed range: 1–1000 · whole numbers

Feed Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Feed Compare

Validate two feeds for the same agency and report which notice codes regressed or were resolved.

Validates the two feeds one after the other: usually under a minute, up to 115 seconds for large feeds.

Feed URLs

2 values · exactly 2

1https://seldoviabayferry.com/sbf_gtfs.zip
2https://rapid.nationalrtap.org/GTFSFileManagement/UserUploadFiles/13696/SVT_GTFS2026.zip

Paste multiple values

Two versions of the same agency feed: baseline first, revised second

Notice codes per feed (optional)

Allowed range: 1–600 · whole numbers

Feed Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

Multilingual Site Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Locale Check

Discover one page's alternate locale cluster and validate its hreflang integrity.

Usually finishes in a few seconds; large locale clusters can take up to 150 seconds.

Page URL

Include sitemap evidence

Max alternates (optional)

Allowed range: 2–20 · whole numbers

Locale Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Locale Compare

Compare 2-5 supplied locale pages and flag the misconfigured one.

Usually finishes in a few seconds; five complex pages can take up to 150 seconds.

Locale page URLs

2 values · 2–5

1https://www.mozilla.org/en-US/firefox/new/
2https://www.mozilla.org/fr/firefox/new/

Paste multiple values

Locale Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

TEI Document Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Edition check

Validate one TEI P5 edition against its RNG grammar and the beyond-schema Schematron layer.

A base TEI-All check usually finishes in under ten seconds. Applying a declared project schema adds a live schema fetch, so the sample run usually takes twenty to thirty seconds.

TEI document source

Use TEI document URLPaste TEI XML

Only the active source is sent. You can switch without losing what you entered.

TEI document URL

Publicly fetchable with no login.

Declared project schema (optional)

ApplySkip

Applied only when the declared schema is hosted on www.tei-c.org or dracor.org. The base TEI-All grammar and Schematron layer run either way.

Maximum findings (optional)

Allowed range: 1–1000 · whole numbers

Most severe first. Left empty, up to 400 are returned.

Edition check

Changes from the previous run

Field	Previous	Current

Raw JSON

Edition compare

Validate a baseline and a revised TEI edition, then list the findings that appeared or cleared.

The two editions are validated one after the other, so this usually finishes in ten to twenty seconds.

Baseline edition (A)

Use Baseline URLPaste Baseline XML

Only the active source is sent. You can switch without losing what you entered.

Revised edition (B)

Use Revised URLPaste Revised XML

Only the active source is sent. You can switch without losing what you entered.

Baseline URL

Baseline first: a finding present only in the revised edition is reported as a regression.

Revised URL

A comparison needs both editions to declare the same root xml:id or publicationStmt idno.

Declared project schema (optional)

ApplySkip

Applied only when the declared schema is hosted on www.tei-c.org or dracor.org. Both editions have to resolve to the same schema to stay comparable.

Maximum findings per edition (optional)

Allowed range: 1–600 · whole numbers

Most severe first. Left empty, up to 300 are collected.

Edition compare

Changes from the previous run

Field	Previous	Current

Raw JSON

Data Package Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Check

Validate one hosted Data Package descriptor and its remote CSV rows: types, constraints, primary keys, and cross-resource foreign keys.

Usually finishes in a few seconds; a large multi-resource package can take up to 110 seconds.

Descriptor source

Use Descriptor URLUse Pasted descriptor

Only the active source is sent. You can switch without losing what you entered.

Descriptor URL

52 of 2048

Resource names (optional)

0 values

Paste multiple values

Leave empty to validate every declared resource, up to 20.

Rows read per resource (optional)

Allowed range: 1–1000000 · whole numbers

Leave empty to read up to 200,000 rows per resource.

Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Compare

Compare two publications of the same Data Package, before and after a refresh or across hosts, and report which conformance findings regressed or were resolved.

Validates the two packages one after the other: usually about ten seconds, up to 115 seconds for large packages.

Descriptor URLs

2 values · exactly 2

1https://pkgstore.datahub.io/core/global-temp/latest/datapackage.json
2https://datahub.io/core/global-temp/datapackage.json

Paste multiple values

Exactly two descriptors for the same dataset, baseline first.

Resource names (optional)

0 values

Paste multiple values

Leave empty to validate every declared resource, up to 20.

Rows read per resource (optional)

Allowed range: 1–1000000 · whole numbers

Leave empty to read up to 100,000 rows per resource in each package.

Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

GEDCOM File Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

GEDCOM check

Validate one deceased-only, public-sample, synthetic, or redacted GEDCOM 7 file with rule-class evidence.

Fetching and validating one file can take up to 110 seconds.

GEDCOM file source

Use GEDCOM file URLUse GEDCOM text

Only the active source is sent. You can switch without losing what you entered.

GEDCOM file URL

A deceased-only, public-sample, synthetic, or redacted .ged file. Never submit living-person data.

Max findings (optional)

Allowed range: 1–1000 · whole numbers

The engine reports at most 100 findings per file

GEDCOM check

Changes from the previous run

Field	Previous	Current

Raw JSON

GEDCOM diff

Compare two GEDCOM 7.0 exports of one tree and list the structures added and removed.

Both files are checked under one shared deadline of up to 110 seconds.

GEDCOM file URLs

2 values · exactly 2

1https://gedcom.io/testfiles/gedcom70/remarriage1.ged
2https://gedcom.io/testfiles/gedcom70/remarriage2.ged

Paste multiple values

Two deceased-only, public-sample, synthetic, or redacted GEDCOM 7.0 URLs: baseline first, revised second.

Max findings (optional)

Allowed range: 1–600 · whole numbers

Caps the added and the removed structures listed, per direction

GEDCOM diff

Changes from the previous run

Field	Previous	Current

Raw JSON

MEI Encoding Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Check

Validate one MEI edition against its RelaxNG grammar and beyond-schema Schematron layer.

A check usually finishes in about five seconds.

MEI edition source

Use MEI file URLPaste MEI XML

Only the active source is sent. You can switch without losing what you entered.

MEI XML

Plain text

Paste the document itself, up to about 5 MB.

Maximum findings (optional)

Allowed range: 1–1000 · whole numbers

Most severe first. Left empty, up to 400 are returned.

Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Compare

Compare a baseline and revised MEI edition, then list findings that appeared or cleared.

The two editions are checked one after the other and usually finish in under ten seconds.

Baseline edition

Use Baseline URLPaste Baseline XML

Only the active source is sent. You can switch without losing what you entered.

Revised edition

Use Revised URLPaste Revised XML

Only the active source is sent. You can switch without losing what you entered.

Baseline XML

Plain text

Paste the earlier edition itself, up to about 5 MB.

Revised XML

Plain text

Paste the later edition itself, up to about 5 MB.

Maximum findings per edition (optional)

Allowed range: 1–600 · whole numbers

Most severe first. Left empty, up to 300 per edition are returned.

Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

Font Checkup

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Font Check

Full QA report on one TTF, OTF, WOFF, or WOFF2 file: structure, naming, license metadata, coverage, metrics, and variable axes.

Usually finishes in a few seconds; a 20 MB font file can take up to 45 seconds.

Font source

Use Font file URLUpload Font file

Only the active source is sent. You can switch without losing what you entered.

Font file URL

Direct public .ttf, .otf, .woff, or .woff2 URL, up to 20 MB. CSS, archive, and page URLs are rejected.

Font Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Family Check

Compare two to eight files from one family and report naming, style, metric, coverage, version, and axis disagreements.

Usually finishes in a few seconds; eight large files can take up to 90 seconds.

Font sources

Use Font file URLsUpload Font files

Only the active source is sent. You can switch without losing what you entered.

Font file URLs

2 values · 2–8

1https://fonts.gstatic.com/s/inter/v20/UcCo3FwrK3iLTcviYwY.woff2
2https://fonts.gstatic.com/s/inter/v20/UcCm3FwrK3iLTcvnUwQT9g.woff2

Paste multiple values

Direct public font-file URLs from one intended family, in any order, up to 20 MB each.

Family Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Geospatial Catalog Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

STAC check

Walk a hosted STAC catalog's link tree under document and depth caps and validate each document reached against its schemas.

Usually finishes in about ten seconds at these caps; a wide catalog at the full caps can take up to 110 seconds.

STAC root URL

The root has to be live and public: uploads and pasted JSON are not accepted.

41 of 2048

Documents to traverse (optional)

Allowed range: 1–200 · whole numbers

Link levels from the root (optional)

Allowed range: 1–8 · whole numbers

Asset URLs to probe (optional)

Allowed range: 0–100 · whole numbers

Findings to return (optional)

Allowed range: 1–1000 · whole numbers

STAC check

Changes from the previous run

Field	Previous	Current

Raw JSON

STAC compare

Compare returned findings from two bounded STAC traversals; matching type and version do not prove lineage, fixes, or a cleaner catalog.

Both roots are walked in the same call: usually a few seconds at these caps, and up to 110 seconds at the full caps.

STAC root URLs

2 values · exactly 2

1https://s3.us-west-2.amazonaws.com/us-west-2.opendata.source.coop/planet/disasterdata/catalog.json?versionId=y6kjA9.U0yO9JeQvp6G49PIG2AVXRyZS
2https://s3-us-west-2.amazonaws.com/us-west-2.opendata.source.coop/planet/disasterdata/catalog.json?versionId=7TEB9eZ_9cvvnEZUsr6Har5UPN4psmyt

Paste multiple values

Baseline root first, revised root second. Both need the same document type and STAC version to be comparable.

Documents per root (optional)

Allowed range: 1–100 · whole numbers

Link levels from each root (optional)

Allowed range: 1–6 · whole numbers

Asset URLs to probe per root (optional)

Allowed range: 0–50 · whole numbers

Findings per root (optional)

Allowed range: 1–600 · whole numbers

STAC compare

Changes from the previous run

Field	Previous	Current

Raw JSON

VOTable Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Check

Validate one hosted or pasted VOTable against astropy's IVOA conformance corpus.

Usually finishes in a few seconds.

VOTable source

Use VOTable URLPaste VOTable XML

Only the active source is sent. You can switch without losing what you entered.

VOTable XML

Plain text

Paste one complete VOTable XML document, up to 5 MB.

Finding limit (optional)

Allowed range: 1–1000 · whole numbers

Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Compare

Compare a baseline and revised VOTable from the same version family and show conformance changes.

Usually finishes in a few seconds.

Baseline and revised VOTables

2 values · exactly 2

1<?xml version="1.0" encoding="UTF-8"?> <VOTABLE version="1.4" xmlns="http://www.ivoa.net/xml/VOTable/v1.3"> <RESOURCE name="demo"> <TABLE name="stars"> <FIELD …
2<?xml version="1.0" encoding="UTF-8"?> <VOTABLE version="1.4" xmlns="http://www.ivoa.net/xml/VOTable/v1.3"> <RESOURCE name="demo"> <TABLE name="stars"> <FIELD …

Paste multiple values

Exactly two URLs or XML documents: baseline first, revised second.

Finding limit per table (optional)

Allowed range: 1–600 · whole numbers

Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

Fediverse Actor Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Actor check

Resolve one handle or actor URL through WebFinger, then check the actor, its endpoints, and its public key.

Usually finishes in a few seconds. Slow or unresponsive hosts can push a run to nearly two minutes.

Handle or actor URL

Handles work with or without the leading @. Actor URLs must be https.

25 of 2048

Probe endpoint reachability

Turn off to check discovery consistency without the endpoint requests.

Actor check

Changes from the previous run

Field	Previous	Current

Raw JSON

Actor compare

Compare two actors on the same instance and report what differs in discovery and reachability.

Usually finishes in a few seconds. Slow or unresponsive hosts can push a run to nearly two minutes.

Two handles or actor URLs

2 values · exactly 2

1@Mastodon@mastodon.social
2https://mastodon.social/actor

Paste multiple values

Use two actors on the same instance or software; other pairs are reported as not comparable.

Probe endpoint reachability

Turn off to check discovery consistency without the endpoint requests.

Actor compare

Changes from the previous run

Field	Previous	Current

Raw JSON

OCDS Package Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Package check

Validate one hosted OCDS release or record package against the standard, its declared extensions, and additional conformance checks.

Usually finishes in a few seconds; complex packages can take up to two minutes.

Package URL

Extension resolution (optional)

AutomaticBundled onlyFetch all

Finding limit (optional)

Allowed range: 1–1000 · whole numbers

Package check

Changes from the previous run

Field	Previous	Current

Raw JSON

Compare

Compare two OCDS packages only when their canonical identity, detected version, and package kind establish the same lineage.

Usually finishes in under ten seconds; complex packages can take up to two minutes.

Package URLs

2 values · exactly 2

1https://cdn.jsdelivr.net/gh/open-contracting/sample-data@e3f59e329ff21a0991dde4fd1593115617c60be3/fictional-example/ocds-213czf-000-00001-01-planning.json
2https://cdn.jsdelivr.net/gh/open-contracting/sample-data@6ca8cc517c1cf4147396f92df95f42b9b55521ef/fictional-example/ocds-213czf-000-00001-01-planning.json

Paste multiple values

Same canonical package/feed identity, version, and package kind only; query strings may differ. Baseline first.

Extension resolution (optional)

AutomaticBundled onlyFetch all

Finding limit per package (optional)

Allowed range: 1–600 · whole numbers

Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

Structure File Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Check file

Validate one hosted PDBx/mmCIF file against the bundled wwPDB DDL2 dictionary.

Usually finishes within one minute.

Structure URL

A public .cif whose text starts with data_, an RCSB or PDBe structure file

Validation checks (optional)

JSON input

Finding limit (optional)

Allowed range: 1–1000 · whole numbers

Check file

Changes from the previous run

Field	Previous	Current

Raw JSON

Compare files

Validate two same-lineage structures and report which conformance findings regressed or resolved.

Usually finishes within one minute.

Structure URLs

2 values · exactly 2

1https://files.rcsb.org/download/1CRN.cif
2https://www.ebi.ac.uk/pdbe/entry-files/download/1crn_updated.cif

Paste multiple values

Exactly two .cif URLs for the same PDB entry: baseline first, revised second

Validation checks (optional)

JSON input

Finding limit (optional)

Allowed range: 1–600 · whole numbers

Compare files

Changes from the previous run

Field	Previous	Current

Raw JSON

Thing Description Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

TD check

Validate one hosted or pasted Thing Description against the TD 1.1 schema and the beyond-schema assertions.

Pasted TDs usually finish in about a second; fetching a public URL can take longer.

Thing Description source

Use TD URLPaste TD JSON-LD

Only the active source is sent. You can switch without losing what you entered.

TD JSON-LD

402 of 2000000

Check explicit defaults

TD check

Changes from the previous run

Field	Previous	Current

Raw JSON

TD comparison

Compare a baseline and revised TD 1.1 document, then show which conformance findings appeared or cleared.

Pasted TDs usually finish in about a second; two public URL fetches can take longer.

Baseline source

Use Baseline TD URLPaste Baseline TD

Only the active source is sent. You can switch without losing what you entered.

Revised source

Use Revised TD URLPaste Revised TD

Only the active source is sent. You can switch without losing what you entered.

Baseline TD

402 of 2000000

Revised TD

404 of 2000000

Check explicit defaults

TD comparison

Changes from the previous run

Field	Previous	Current

Raw JSON

Calendar File Check

Connect agent

Guest access is available after setup. Full account linking verified by PowMCP: Claude only.

Feed Check

Check one public .ics feed against RFC 5545 and locate every structural finding by component.

Usually finishes in a second or two; a large multi-year feed can take up to 60 seconds.

Feed URL

Public HTTP(S) or webcal link, detected by content rather than by file extension

49 of 2048

Recurrence window (± months) (optional)

Allowed range: 1–60

Occurrence cap (optional)

Allowed range: 1–20000

Feed Check

Changes from the previous run

Field	Previous	Current

Raw JSON

Feed Compare

Run the same RFC 5545 checks on two public .ics feeds and report where they differ.

Checks the two feeds one after the other: usually a few seconds, up to 60 seconds for large multi-year feeds.

Feed URLs

2 values · exactly 2

1https://www.w3.org/groups/wg/css/calendar/export/
2https://www.w3.org/groups/wg/aria/calendar/export/

Paste multiple values

Exactly two feeds, compared in the order you list them

Recurrence window (± months) (optional)

Allowed range: 1–60

Occurrence cap (optional)

Allowed range: 1–20000

Feed Compare

Changes from the previous run

Field	Previous	Current

Raw JSON

This workspace needs JavaScript for in-page app switching. Every app remains available on its standalone page:

Local development sign-in

Billing simulator

Speed Audit

Changes from the previous run

Speed Compare

Changes from the previous run

SSL Check

Changes from the previous run

Privacy Scan

Changes from the previous run

Privacy Compare

Changes from the previous run

Check

Changes from the previous run

Compare

Changes from the previous run

WCAG

Changes from the previous run

Advisory Check

Changes from the previous run

Compare

Changes from the previous run

Provider Scan

Changes from the previous run

Check

Changes from the previous run

Compare

Changes from the previous run

Mobile Check

Changes from the previous run

PDF check

Changes from the previous run

PDF compare

Changes from the previous run

Release Check

Changes from the previous run

Track Compare

Changes from the previous run

JS scan

Changes from the previous run

SBOM Check

Changes from the previous run

SBOM Compare

Changes from the previous run

Header Check

Changes from the previous run

Link Check

Changes from the previous run

Caption Check

Changes from the previous run

Caption Compare

Changes from the previous run

WCAG Check

Changes from the previous run

Build Comparison

Changes from the previous run

Spec Check

Changes from the previous run

Build Compare

Changes from the previous run

Package Check

Changes from the previous run

Compare specs

Changes from the previous run

SEO Check

Changes from the previous run

Domain check

Changes from the previous run

Domain compare

Changes from the previous run

Issuer check

Changes from the previous run

Comparison

Changes from the previous run

Check

Changes from the previous run

Compare

Changes from the previous run

Manifest Check