Comparison

Pa11y vs Stark

On the evidence we track, Stark leads this comparison with a composite score of 61/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

Pa11y full profile →Stark full profile →

Machine formatsJSON Markdown GraphQLor send Accept: application/json

Pa11y45

★Stark61

Attribute comparison across 2 tools
Attribute	Pa11y	StarkLeader
Vioscale score	45 / 100low · 30%	61 / 100medium · 55%
Pricing
Free tierpricing.free_tier	✓	✓
Modelpricing.model	open_source	freemium
Price levelpricing.price_level	free	high
Starting pricepricing.starting_price	-	$2,500
Transparentpricing.transparent	✓	✓
Integrations
Countintegrations.count	-	12
Security
Disclosure policysecurity.disclosure_policy	-	✓
Gdprsecurity.gdpr	-	✓
Scorecardsecurity.scorecard	7.3	-
Soc2security.soc2	-	✓
Vulnerabilitiessecurity.vulnerabilities	Count: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=pa11y&per_page=100 · Last 12m: 0	-
Adoption
Dependent reposadoption.dependent_repos	1,668	-
Github starsadoption.github_stars	4,490	-
Activity
Commits last 30dactivity.commits_last_30d	3	-
Release
Cadence daysrelease.cadence_days	131	-
Historyrelease.history	6 items	-
License
Spdxlicense.spdx	LGPL-3.0	-
Language
Primarylanguage.primary	JavaScript	-
Market
Availabilitymarket.availability	-	Available worldwide

Score

Vioscale score

Pa11y45 / 100low · 30%

Stark61 / 100medium · 55%

Pricing

Free tier

Pa11y✓

Stark✓

Model

Pa11yopen_source

Starkfreemium

Price level

Pa11yfree

Starkhigh

Starting price

Pa11y–

Stark$2,500

Transparent

Pa11y✓

Stark✓

Integrations

Count

Pa11y–

Stark12

Security

Disclosure policy

Pa11y–

Stark✓

Gdpr

Pa11y–

Stark✓

Scorecard

Pa11y7.3

Stark–

Soc2

Pa11y–

Stark✓

Vulnerabilities

Pa11yCount: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=npm&package_name=pa11y&per_page=100 · Last 12m: 0

Stark–

Adoption

Dependent repos

Pa11y1,668

Stark–

Github stars

Pa11y4,490

Stark–

Activity

Commits last 30d

Pa11y3

Stark–

Release

Cadence days

Pa11y131

Stark–

History

Pa11y6 items

Stark–

License

Spdx

Pa11yLGPL-3.0

Stark–

Language

Primary

Pa11yJavaScript

Stark–

Market

Availability

Pa11y–

StarkAvailable worldwide

Capabilities

Feature-by-feature on the axes that matter for accessibility testing. “-” means undocumented, not absent.

Capability comparison for Accessibility Testing
Capability	Pa11y	Stark
Capabilities
Scan method	Automated rules engine	Automated rules engine
Wcag level	-	AA
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	✓	-

Capabilities

Scan method

Pa11yAutomated rules engine

StarkAutomated rules engine

Wcag level

Pa11y-

StarkAA

Ci cd integration

Pa11y✓

Stark✓

Browser extension

Pa11y-

Stark✓

Design stage plugin

Pa11y-

Stark✓

CMS plugins

Pa11y-

Stark-

Continuous monitoring

Pa11y✓

Stark✓

Vpat acr generation

Pa11y-

Stark✓

Manual audit service

Pa11y-

Stark-

Overlay widget

Pa11y-

Stark-

Document PDF testing

Pa11y-

Stark-

Open source

Pa11y✓

Stark-

What each one is

The product in its own terms, so the numbers below have context.

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

Stark

Leader

Integrated platform that helps teams detect and remediate accessibility problems throughout the design and development lifecycle, combining automated scanning with continuous monitoring and real-time compliance reporting.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

Pa11y

Open sourceFree tier

Free and open source

as of 2026-08-21verify ↗

Stark

Leader

from $2500/yrSubscriptionFree tier

From $198/user/year (Premium Pack, minimum 3 seats) or from $2,500/year (Launch plan). Free tier available.

Premium Pack$198/user/year (minimum 3 seats)
- Automated detection and remediation tooling (Figma only)
- Automatic WCAG scans and reports in browser
- Live code highlighting in browser web dev console
Launch$2,500/year
- 25 viewers included
- Monitor up to 100 pages
- Weekly automated scans and reports
- Supported assets: Figma, code repos, public URLs
- 30-day report data storage
- +1 more
Grow$8,000/year
- 50 viewers included
- Monitor up to 1000 pages
- Daily scans and insight reports
- Supported assets: Figma, code repos, CI/CD, iOS, Android, public and private URLs
- 180-day report data storage
- +4 more
ScaleContact sales
- Unlimited viewers
- Monitor up to 4000 pages
- Real-time scans and insights reports
- 365-day report data storage
- Single Sign-On (SSO) and JIT provisioning
- +3 more

as of 2026-08-25verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platform and deployment support comparison
Supports	Pa11y	Stark
WebPlatforms	✓	✓
iOSPlatforms	✗	✓
AndroidPlatforms	✗	✓
macOSPlatforms	✗	✓
LinuxPlatforms	✓	✗
CLIPlatforms	✓	✓
Cloud / SaaSDeployment	✓	✓
Self-hostedDeployment	✓	✗

Platforms

Web

Pa11y✓

Stark✓

iOS

Pa11y✗

Stark✓

Android

Pa11y✗

Stark✓

macOS

Pa11y✗

Stark✓

Linux

Pa11y✓

Stark✗

CLI

Pa11y✓

Stark✓

Deployment

Cloud / SaaS

Pa11y✓

Stark✓

Self-hosted

Pa11y✓

Stark✗

Integrations

What each product connects to. Counts come from the vendor's own integration directory where one exists.

Pa11y

Not documented yet.

Stark

Leader

12 total

Figma
Sketch
GitHub
Chrome
Arc
Safari
Microsoft Edge
Brave
Storybook
React
iOS
Android

Independently observed

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.