Catalog comparison
Google LighthousePa11y
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.
Lighthouse is an open-source, automated tool to help improve the quality of web pages. It has audits for performance, accessibility, SEO, and best practices. Lighthouse can be run in Chrome DevTools, from the command line, or as a Node module.
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
Google Lighthouse
Accessibility
Pa11y
Accessibility
Primary capability
Google Lighthouse
Accessibility
Pa11y
Accessibility
License and pricing
Google Lighthouse
free · open source
Pa11y
free · open source
Free trial
Google Lighthouse
No
Pa11y
No
Complexity
Google Lighthouse
beginner
Pa11y
beginner
Team fit
Google Lighthouse
enterprise, individual, large, medium, small
Pa11y
enterprise, large, medium, small
Test authoring languages
Google Lighthouse
CSS, HTML, JavaScript, Node.js
Pa11y
CSS, HTML, JavaScript, JSON, Node.js
Supported platforms
Google Lighthouse
browser-based, chrome, chrome devtools, command line, linux, macos, node.js, web, windows
Pa11y
Azure DevOps, CLI, Docker, GitHub Actions, GitLab CI, Jenkins, Node.js, Web
MCP server
Google Lighthouse
No
Pa11y
No
Key features (catalog)
Google Lighthouse
ADA compliance checking, ARIA attribute validation, Automated accessibility audits, Best practices validation, Color contrast analysis, Command line interface, Custom audit configurations, Detailed reports with actionable insights, EN 301 549 compliance support, Integration with Chrome DevTools +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)
Google Lighthouse
Limited to web-based content, May not catch all accessibility issues, Performance depends on network conditions, Requires Chrome browser for DevTools version, Some audits require manual verification
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 | Google Lighthouse | Pa11y |
|---|---|---|
| Primary testing surface | Accessibility | Accessibility |
| Primary capability | Accessibility | Accessibility |
| License and pricing | free · open source | free · open source |
| Free trial | No | No |
| Complexity | beginner | beginner |
| Team fit | enterprise, individual, large, medium, small | enterprise, large, medium, small |
| Test authoring languages | CSS, HTML, JavaScript, Node.js | CSS, HTML, JavaScript, JSON, Node.js |
| Supported platforms | browser-based, chrome, chrome devtools, command line, linux, macos, node.js, 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 audits, Best practices validation, Color contrast analysis, Command line interface, Custom audit configurations, Detailed reports with actionable insights, EN 301 549 compliance support, Integration with Chrome DevTools +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) | Limited to web-based content, May not catch all accessibility issues, Performance depends on network conditions, Requires Chrome browser for DevTools version, Some audits require manual verification | 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 Google Lighthouse if…
- you need coverage for browser-based, chrome, chrome devtools, command line
- 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
- you care about Accessibility improvement recommendations and Accessibility issue highlighting and reporting
Questions to verify before choosing
- Confirm current pricing and packaging on the Google Lighthouse 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.