Pa11y and axe for Accessibility Testing

Pa11y and axe-core are open-source tools that automate WCAG-aligned accessibility testing. Both parse a page, run rules against the DOM, and report violations. Catch the bulk of accessibility issues automatically; reserve manual testing for the rest.

axe-core is a JavaScript library that powers the accessibility audits in Chrome DevTools, Lighthouse, Jest, Cypress, Playwright and many other tools. It is the de facto standard for automated accessibility testing — broad rule coverage, low false-positive rate.