vioscale
Accessibility TestingUnclaimed

Pa11y

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Also known as
pa11y

What is Pa11y?

A suite of free and open-source tools for identifying and tracking accessibility issues on websites. Provides both automated testing via a web dashboard and command-line utilities for developers.

Independently observed

Pa11y pricing

We don't have Pa11y's full plan breakdown yet (its pricing page resisted automated reading). Here's what we could confirm. Always check live pricing for exact numbers.

Pricing as of verify at live pricing ↗Independently observed
Open sourceFree tier

Free and open source

What Pa11y does

The capabilities that matter for accessibility testing, normalised so it lines up with every alternative. “-” means we haven't confirmed it, not that it's missing.

Capabilities
Scan method
Automated rules engine
Wcag level
-
Ci cd integration
✓
Browser extension
-
Design stage plugin
-
CMS plugins
-
Continuous monitoring
✓
Vpat acr generation
-
Manual audit service
-
Overlay widget
-
Document PDF testing
-
Open source
✓
Independently observed

Platform & deployment

Independently observed
Platforms
  • CLI
  • Web
  • Linux
Deployment
  • Cloud / SaaS
  • Self-hosted

Security & compliance

Known vulnerabilities: 0 (0 in the last 12 months) sourcea count reflects scale & disclosure, not quality

Pa11y alternatives

Other accessibility testing we track, ranked by the same independent score.

All Pa11y alternatives, ranked →

Compare Pa11y

Side by side against other accessibility testing, attribute by attribute, with a source on every value.

Independent · unbought · dated

The Vioscale score: one lens on the evidence

Not user reviews and not a paid placement: a confidence-weighted blend of the independent signals below (adoption, activity, security posture, and more), which you can sort and re-weight yourself. Vendors can correct their listing but can never move their rank, and stars are weighted low as a vanity metric. It is one way to read the evidence for Pa11y, not the verdict.

Balanced composite 45 / 100
low · 30%updating
Signal contributions to the composite score
SignalScoreWeightContributionEvidence
Capabilities580.084.5✓
Dependent projects540.063.4✓
Security score730.043.1✓
Stars690.031.8✓
Development activity190.091.8✓
Release cadence270.051.4✓
Integrations00.070.0-
Security posture00.070.0-
Package downloads00.140.0-
Developer Q&A activity00.060.0-

Computed . Re-weight it by intent, or see the full method.

All data & sourcesshow ↓

Every value we hold, with its source, retrieval date, and confidence. This is the evidence behind the score: don't trust it, verify it.

Activity

AttributeValueEvidence
Commits last 30d3mediumsource · 2026-08-26 · 65%

Adoption

AttributeValueEvidence
Github stars4,490highsource · 2026-08-26 · 90%
Dependent repos1,668highsource · 2026-08-26 · 85%

Features

AttributeValueEvidence
CapabilitiesOpen source: Yes · Scan method: automated-rules-engine · Ci cd integration: Yes · Continuous monitoring: Yesmediumsource · 2026-08-21 · 60%

Language

AttributeValueEvidence
PrimaryJavaScripthighsource · 2026-08-26 · 90%

License

AttributeValueEvidence
SpdxLGPL-3.0highsource · 2026-08-26 · 95%

Pricing

AttributeValueEvidence
Free tierYesmediumsource · 2026-08-21 · 60%
Modelopen_sourcemediumsource · 2026-08-21 · 60%
Price levelfreemediumsource · 2026-08-21 · 60%
TransparentYesmediumsource · 2026-08-21 · 60%

Release

AttributeValueEvidence
Cadence days131mediumsource · 2026-08-26 · 70%
History6 itemsmediumsource · 2026-08-26 · 70%

Security

AttributeValueEvidence
Scorecard7.3highsource · 2026-08-26 · 90%
VulnerabilitiesCount: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=pa11y&per_page=100 · Last 12m: 0highsource · 2026-08-26 · 90%