Best Free Accessibility Testing Tools in 2026

Accessalyze is the only tool on this list where the free tier requires zero installation and works for people who don't write code. You paste a URL, get a full WCAG 2.1 AA scan, and can share the results — all in under a minute.

The free scan gives you every violation found, grouped by WCAG criterion, with the affected element and a description of why it fails. The $19 full compliance report adds priority scoring, executive summary, a complete violation list with remediation guidance, and a format suitable for ADA legal documentation.

Accessalyze is the only tool on this list that generates AI fix code for each violation — not just a flag, but corrected HTML, CSS, or JavaScript you can review and apply.

Best for: Teams that need quick results without setup, agencies that need client-ready reports, legal/compliance teams, and anyone who wants AI fix code instead of just violation flags.

WAVE (Web Accessibility Evaluation Tool) is developed by WebAIM at Utah State University and is one of the most recognized names in accessibility testing. The browser extension (Chrome and Firefox) overlays colored icons directly on your page — red icons for errors, yellow for alerts, blue for structural elements, purple for ARIA roles.

This visual overlay approach is genuinely useful. You can see exactly where on the rendered page an issue appears, which is faster than cross-referencing a violation list with a line of source code. For visual designers and developers who are new to accessibility, WAVE's inline feedback is a strong learning tool.

Best for: Developers and designers who want to visually inspect individual pages, especially for learning WCAG concepts. Not suitable for bulk scanning, automation, or generating documentation.

axe-core is the most widely deployed accessibility testing engine in the world. It powers accessibility tests at Google, Microsoft, and thousands of engineering teams. The free tier includes the browser extension (Chrome/Firefox DevTools panel) and the open-source axe-core npm package.

The npm package is where axe really shines: you can add jest-axe, cypress-axe, or @axe-core/playwright to your test suite and fail builds that introduce new WCAG violations. The ruleset has one of the lowest false-positive rates of any automated tool, which means less noise in your CI output.

Best for: Engineering teams who want accessibility checks embedded in their CI/CD pipeline and test suite. Not suitable for non-developers or anyone who needs shareable reports.

Google Lighthouse is built into Chrome DevTools (open DevTools → Lighthouse tab). It audits a page for performance, SEO, best practices, and accessibility — all in one run. The accessibility score (0–100) is a useful quick benchmark.

Lighthouse uses axe-core under the hood for its accessibility checks, so the rule coverage is similar to axe DevTools. The key difference is the combined report format: you get accessibility, performance, and SEO together, which is useful for getting a holistic view of a page during development.

Best for: Developers who want a quick accessibility sanity check alongside performance audits. Not a substitute for a full accessibility audit.

NVDA (NonVisual Desktop Access) is a free, open-source screen reader for Windows developed by NV Access. It's the most widely used free screen reader and the primary assistive technology for blind and low-vision users on Windows outside of enterprise environments.

For accessibility testing, NVDA is essential for any manual evaluation. Automated tools cannot tell you whether a screen reader user can actually navigate and understand your UI — only a real screen reader can. Testing with NVDA + Firefox or Chrome reveals issues that no automated scanner catches: confusing landmark navigation, ambiguous form flows, poor focus management, and ARIA patterns that are technically valid but practically unusable.

Best for: Testers and developers who want to validate the real screen reader experience. Every site should be tested with at least one screen reader, but this is not a substitute for automated scanning — both are required.

VoiceOver is Apple's built-in screen reader, available on macOS, iOS, and iPadOS at no cost. On Mac, activate it with Command+F5 or through System Settings → Accessibility. On iPhone/iPad, triple-click the side button.

VoiceOver with Safari is the most common assistive technology combination on mobile (iOS) and is widely used on Mac. For complete accessibility coverage, you should test with both NVDA+Firefox/Chrome (Windows) and VoiceOver+Safari (Mac/iOS) — they handle ARIA patterns and focus management somewhat differently.

Best for: Mac and iOS testing. Test with VoiceOver+Safari for any site that targets mobile or Apple users. Pair with NVDA for cross-platform coverage.

Color contrast is one of the most common WCAG failures, and several free tools check it. The two most useful:

• Colour Contrast Analyser (TPGi / formerly The Paciello Group) — A desktop app (Windows/Mac) that lets you eyedropper any color on screen and check it against WCAG AA and AAA ratios. Invaluable for checking real-world colors on non-HTML content (PDFs, images, videos).
• WebAIM Contrast Checker — A free web tool at webaim.org/resources/contrastchecker where you enter hex values and see pass/fail for all WCAG levels. No install required.

Automated scanners (Accessalyze, WAVE, axe) all check color contrast as part of their rulesets. These dedicated tools are most useful when you need to check colors in design files, PDFs, images, or other non-HTML contexts, or when you need to pick a new color that passes before coding it up.

Best for: Designers checking colors before or during development, or anyone who needs to check contrast in PDFs, images, or design tools where browser-based scanners don't reach.

IBM's Equal Access Checker is a browser extension (Chrome/Firefox) that includes one of the most comprehensive WCAG 2.1 rulesets of any free tool. It surfaces issues that axe and Lighthouse sometimes miss, particularly around ARIA patterns and more nuanced WCAG criteria.

IBM also provides the tool as an open-source npm package (accessibility-checker) for Node.js integration, similar to axe-core. The HTML report export is one of the more readable report formats in the free tool landscape.

Best for: Teams that want the most comprehensive automated WCAG rule coverage and are willing to triage more false positives. Good complement to axe-core — run both to maximize automated issue detection.