12 Best Accessibility Testing Tools for Websites

Accessibility checks are useful whether you run a small shop, build client websites, or look after a larger product. The right tools can flag common barriers early, but no scanner can decide whether a page makes sense to someone using a keyboard or screen reader.

This list combines quick browser checks, repeatable developer workflows, and manual testing aids. Treat results as a starting point, then verify fixes with people and assistive technology where possible.

Quick picks

• Best overall: axe DevTools — clear issue details inside the browser.
• Best free scan: WAVE — visual markers make page problems easy to spot.
• Best for Chrome users: Accessibility Insights for Web — guided checks include keyboard and tab-stop review.
• Best for automated tests: axe-core with Playwright — add accessibility checks to a repeatable test suite.

How we picked

We chose established tools that cover different parts of a practical audit, from a single page to a development pipeline. Use several methods rather than treating any one score as proof of compliance:

• Useful findings: does the tool explain what to inspect or change?
• Workflow fit: can a designer, content editor, or developer use it naturally?
• Coverage: does it support visual, keyboard, code, or assistive-technology checks?
• Limits: is the scope of automated findings easy to understand?

Browser checks and guided audits

1. axe DevTools

axe DevTools adds Deque's accessibility engine to browser-based page inspection, showing detected issues alongside relevant elements and guidance. It is helpful when a developer is already checking layout and markup in the browser, and the free extension provides a convenient first pass; advanced workflows and features have paid plans. Automated results still cannot judge whether instructions are understandable or whether a screen-reader experience is coherent.

Best for: developers who want actionable findings beside the page they are debugging.

2. WAVE

WAVE marks errors, contrast concerns, structural landmarks, and other page details directly on the page, making the relationship between a warning and its location visible. Its browser extensions are handy for reviewing pages that are not public, while the online service can inspect a public URL. It is free to use, but visual indicators need interpretation: a warning is not always a failure, and a clean report does not equal an accessible site.

Best for: content editors and designers who learn fastest from annotations on the actual page.

3. Lighthouse

Google Chrome's Lighthouse includes an accessibility category in its page audit, alongside performance and other quality checks. Run it from Chrome DevTools to get a quick, repeatable snapshot without installing a separate product; Lighthouse is free. Its accessibility score is based on a subset of automated checks, so it will not catch every WCAG issue or replace keyboard and screen-reader testing.

Best for: site owners who already use Chrome and want accessibility in a broader page-health review.

4. Accessibility Insights for Web

Accessibility Insights for Web offers FastPass for automated checks and tab stops, plus a guided assessment process for deeper manual review. That combination makes it useful for teams learning to go beyond a one-click scan. The browser extension is free, though a full assessment takes time and requires a person to make judgements that automation cannot make.

Best for: teams that want a structured path from a quick scan to hands-on inspection.

5. ARC Toolkit

The ARC Toolkit browser extension helps inspect a page for accessibility issues and provides details that can guide further investigation. It is particularly relevant to designers and developers who want an additional browser-based view of page semantics and common barriers. The extension is available free; as with other automated checkers, it can identify patterns but cannot determine whether a control is understandable in context.

Best for: practitioners who want another detailed browser inspection tool in their audit kit.

6. Siteimprove Accessibility Checker

Siteimprove provides a browser extension that checks the current page and surfaces accessibility concerns in context. It can suit content and marketing teams who need to review pages without starting in source code, while Siteimprove's wider platform offers broader site-management capabilities. The extension has free access, but the broader platform is paid; a page-level check is not a full-site audit.

Best for: publishing teams reviewing individual pages as part of routine content work.

Code and repeatable workflows

7. Pa11y

Pa11y is an open-source command-line accessibility testing tool that can check web pages and report issues using established accessibility rules. Developers can run it locally or build it into a scripted review, which is useful for checking changes before release. It is free and flexible, but command-line setup and the need to manage test pages make it less approachable for nontechnical users; automated output still needs human triage.

Best for: developers who want a lightweight command-line check they can adapt to their project.

8. IBM Equal Access Accessibility Checker

IBM's Equal Access Accessibility Checker is an open-source accessibility checker available for browser and developer workflows, including integration with common testing environments. Its rule engine can help teams catch recurring code-level problems and review results during development. It is free, but adopting it means learning its reports and configuring it for the team's stack; passing checks does not establish that a complete experience is usable.

Best for: engineering teams that prefer an open-source checker with options for integration.

9. axe-core with Playwright

axe-core is Deque's open-source accessibility engine, and Playwright can load pages and run browser tests. Together they let a development team add automated accessibility checks to tests that already visit important screens. Both are free and open source, but setup requires code and selectors or page flows that stay maintained; the checks cover detectable rules, not subjective quality or every user journey.

Best for: teams that want accessibility checks to run against key pages during development.

Manual and design-focused testing

10. Polypane

Polypane is a browser built for web development, with tools for viewing pages at multiple sizes and inspecting accessibility-related details such as contrast and page structure. Seeing responsive views together can help catch layout changes that hide content or disrupt focus. It is paid software with a free trial; it is a specialised browser, not a replacement for testing in the browsers your audience uses.

Best for: web designers checking responsive layouts and accessibility details in one workspace.

11. Stark

Stark brings accessibility checks into design and product workflows, with tools for colour contrast, simulation, and design-file review across supported apps. Designers can spot contrast trouble earlier, before a polished mock-up turns into code. Stark offers free and paid plans; design-stage checks cannot confirm how the final interactive page behaves with a keyboard or assistive technology.

Best for: product designers who want to catch colour and design-system issues before handoff.

12. NVDA

NVDA is a free, open-source screen reader for Windows that reads web content aloud and supports keyboard-based navigation. Testing with it can reveal unlabeled buttons, confusing reading order, and missing announcements that automated tools will not understand. NVDA is free, but it takes practice to use effectively, and results should not be assumed to represent every screen reader or operating system.

Best for: developers and testers willing to learn a real screen-reader workflow on Windows.

How to choose the right one

Start with the way you work. A solo site owner may begin with WAVE or Lighthouse, then use a keyboard to check menus, forms, and dialogs. A developer can add axe-core or Pa11y to regular tests, while a design team may get more value from Stark before implementation. Stockio's contrast checker is a useful quick check for foreground and background colour combinations; it does not evaluate the rest of a page.

For a deeper process, combine an automated scan with manual review. Our guide to an accessibility audit and actionable report explains how to turn findings into a useful plan, and the screen-reader testing workflow offers a practical next step. You can also browse more accessibility articles.

Key takeaways

• A scanner can find common code and contrast issues, but it cannot certify a whole experience.
• Use browser extensions to investigate pages in context and developer tools to repeat checks.
• Include keyboard navigation and screen-reader testing for behaviour that automation misses.
• Choose tools that fit your actual workflow; a small, consistent routine beats an unused platform.
• Retest after fixes, because one change can improve one page while creating a new barrier elsewhere.