Catalog comparison
axe (Deque)Pa11y
Side-by-side facts from the TestGuild Tool Matcher catalog. Empty cells mean the catalog does not list that attribute — not that the product lacks it.
axe is the world's leading digital accessibility toolkit. It provides automated accessibility testing through browser extensions, developer tools, and libraries. axe helps developers find and fix accessibility issues in web applications.
A comprehensive suite of free and open source tools to help designers and developers make their web pages more accessible. Pa11y believes making the web more accessible improves it for everyone.
At a glance
Primary testing surface
axe (Deque)
Accessibility
Pa11y
Accessibility
Primary capability
axe (Deque)
Accessibility
Pa11y
Accessibility
License and pricing
axe (Deque)
free
Pa11y
free · open source
Free trial
axe (Deque)
No
Pa11y
No
Complexity
axe (Deque)
beginner
Pa11y
beginner
Team fit
axe (Deque)
enterprise, individual, large, medium, small
Pa11y
enterprise, large, medium, small
Test authoring languages
axe (Deque)
Angular, CSS, HTML, JavaScript, React, TypeScript, Vue
Pa11y
CSS, HTML, JavaScript, JSON, Node.js
Supported platforms
axe (Deque)
browser-based, chrome, edge, firefox, linux, macos, node.js, safari, web, windows
Pa11y
Azure DevOps, CLI, Docker, GitHub Actions, GitLab CI, Jenkins, Node.js, Web
MCP server
axe (Deque)
No
Pa11y
No
Key features (catalog)
axe (Deque)
ADA compliance checking, ARIA attribute validation, Automated accessibility testing, Browser extension for manual testing, CI/CD pipeline integration, Color contrast analysis, Custom accessibility rules, Custom rule creation, Detailed accessibility reports, Developer tools integration +12 more
Pa11y
Accessibility improvement recommendations, Accessibility issue highlighting and reporting, Automated accessibility compliance reporting, Automated accessibility issue detection, CI/CD pipeline integration, Command-line interface for one-off accessibility testing, Cross-platform compatibility, Custom dashboard front-end capabilities, Daily automated accessibility monitoring, Extensible architecture for custom needs +14 more
Limitations (catalog)
axe (Deque)
Browser extension requires manual activation, Limited to web-based content, May not catch all dynamic content issues, Requires manual verification for some issues, Some advanced accessibility features need human testing
Pa11y
Limited to WCAG guidelines compliance, Limited to web accessibility testing only, May generate false positives requiring manual review, May not catch all accessibility issues (manual testing still needed), No enterprise support or SLA guarantees, No mobile app accessibility testing, Requires JavaScript-enabled environment, Requires web pages to be publicly accessible or properly configured
| Attribute | axe (Deque) | Pa11y |
|---|---|---|
| Primary testing surface | Accessibility | Accessibility |
| Primary capability | Accessibility | Accessibility |
| License and pricing | free | free · open source |
| Free trial | No | No |
| Complexity | beginner | beginner |
| Team fit | enterprise, individual, large, medium, small | enterprise, large, medium, small |
| Test authoring languages | Angular, CSS, HTML, JavaScript, React, TypeScript, Vue | CSS, HTML, JavaScript, JSON, Node.js |
| Supported platforms | browser-based, chrome, edge, firefox, linux, macos, node.js, safari, web, windows | Azure DevOps, CLI, Docker, GitHub Actions, GitLab CI, Jenkins, Node.js, Web |
| MCP server | No | No |
| Key features (catalog) | ADA compliance checking, ARIA attribute validation, Automated accessibility testing, Browser extension for manual testing, CI/CD pipeline integration, Color contrast analysis, Custom accessibility rules, Custom rule creation, Detailed accessibility reports, Developer tools integration +12 more | Accessibility improvement recommendations, Accessibility issue highlighting and reporting, Automated accessibility compliance reporting, Automated accessibility issue detection, CI/CD pipeline integration, Command-line interface for one-off accessibility testing, Cross-platform compatibility, Custom dashboard front-end capabilities, Daily automated accessibility monitoring, Extensible architecture for custom needs +14 more |
| Limitations (catalog) | Browser extension requires manual activation, Limited to web-based content, May not catch all dynamic content issues, Requires manual verification for some issues, Some advanced accessibility features need human testing | Limited to WCAG guidelines compliance, Limited to web accessibility testing only, May generate false positives requiring manual review, May not catch all accessibility issues (manual testing still needed), No enterprise support or SLA guarantees, No mobile app accessibility testing, Requires JavaScript-enabled environment, Requires web pages to be publicly accessible or properly configured |
How the trade-offs apply to your team
Guidance below is inferred only from catalog differences. It is not a winner pick.
Consider axe (Deque) if…
- you need coverage for browser-based, chrome, edge, firefox
- your team writes tests in Angular, React, TypeScript, Vue
- you care about ADA compliance checking and ARIA attribute validation
Consider Pa11y if…
- you need coverage for Azure DevOps, CLI, Docker, GitHub Actions
- your team writes tests in JSON, Node.js
- open source matters for your team
- you care about Accessibility improvement recommendations and Accessibility issue highlighting and reporting
Questions to verify before choosing
- Confirm current pricing and packaging on the axe (Deque) and Pa11y websites.
- Trial both tools against a real slice of your application, not a demo site.
- Verify the exact browser, device, or OS matrix you must support.