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WebAIM's web accessibility evaluation tool and browser extension that annotates issues in-page.
Other tools in the same categories.
dequelabs/axe-core
Deque's accessibility rules engine behind most a11y tooling, with Playwright, Cypress and Jest integrations.
GoogleChrome/lighthouse
Google's automated auditing for performance, Core Web Vitals, accessibility and SEO.
jsx-eslint/eslint-plugin-jsx-a11y
ESLint rules that statically flag accessibility problems in JSX, included in most React configs.
pa11y/pa11y
Command-line and CI accessibility tester that runs axe or HTML_CodeSniffer against URLs.
microsoft/accessibility-insights-web
Microsoft's browser extension and app for automated checks plus guided manual WCAG assessments.
NickColley/jest-axe
Custom matcher that runs axe on rendered components in Jest or Vitest unit tests.