5 Best Free Accessibility Scanners
TLDR
WAVE and axe DevTools are the two best free accessibility scanners. WAVE is easier for non-developers; axe DevTools is better for developers. Lighthouse provides a useful accessibility score but misses issues the others catch. Pa11y and ARC Toolkit fill niche roles. All free tools share a limitation: manual, page-by-page testing. For automated site-wide scanning and fix suggestions, you need a paid tool.
| Tool | Type | WCAG Coverage | CI/CD | Best For |
|---|---|---|---|---|
| WAVE | Browser extension | Good (HTML5/ARIA rules) | No | Non-developers, visual checks |
| axe DevTools (free) | Browser extension | Strong (axe-core engine) | No (Pro only) | Developers, detailed results |
| Lighthouse | Chrome built-in | Partial (subset of rules) | Yes (Lighthouse CI) | Quick baseline scores |
| Pa11y | Command-line | Strong (WCAG 2.1 AA/AAA) | Yes | CI/CD pipelines |
| ARC Toolkit | Browser extension | Moderate (ARIA focus) | No | ARIA evaluation, heading checks |
WAVE
Free browser extension by WebAIM that visually highlights accessibility issues directly on the page.
Pros
- ✓ Completely free, no account required
- ✓ Visual overlay shows issues on the actual page
- ✓ Easy for non-developers to understand
- ✓ Contrast checker built in
Cons
- × Manual, one-page-at-a-time testing
- × No automated site-wide scanning
- × No fix suggestions or code generation
- × No compliance reporting
Pricing: Free (browser extension)
Verdict: Best free tool for non-developers. Visual issue highlighting makes it easy to understand what is wrong and where.
axe DevTools (free tier)
Free browser extension by Deque using the industry-standard axe-core engine. Developer-focused accessibility testing.
Pros
- ✓ Industry-standard axe-core scanning engine
- ✓ Detailed developer-friendly results
- ✓ Integrates with browser DevTools
- ✓ Clear WCAG criterion mapping per issue
Cons
- × Free tier is manual, page-by-page only
- × Interface assumes developer knowledge
- × No fix suggestions
- × CI/CD integration requires paid Pro plan
Pricing: Free (browser extension)
Verdict: Best free tool for developers. The axe-core engine is the industry standard. Free tier covers automated rule testing; Pro adds guided testing and CI integration.
Lighthouse
Google's built-in Chrome DevTools audit tool. Scores accessibility alongside performance, SEO, and best practices.
Pros
- ✓ Zero setup — built into every Chrome browser
- ✓ Accessibility score is easy to communicate to stakeholders
- ✓ Can be run from command line via Lighthouse CI
- ✓ Covers performance and SEO alongside accessibility
Cons
- × Tests fewer accessibility rules than WAVE or axe
- × Passing score does not mean WCAG compliant
- × Single-page testing only
- × Accessibility is one section, not the primary focus
Pricing: Free (built into Chrome)
Verdict: Most accessible tool since it requires no installation. Accessibility score is useful as a baseline but misses issues that WAVE and axe catch.
Pa11y
Open-source command-line accessibility testing tool for automated WCAG checks.
Pros
- ✓ Free and open source
- ✓ Command-line integration for CI/CD
- ✓ Supports WCAG 2.1 AA and AAA
- ✓ Pa11y Dashboard adds a web interface
Cons
- × Requires command-line knowledge
- × No visual interface out of the box
- × Setup requires more effort than browser extensions
- × Smaller community than axe or WAVE
Pricing: Free (open source, MIT license)
Verdict: Best free option for automated CI/CD integration. Requires command-line comfort but enables accessibility testing in build pipelines at no cost.
ARC Toolkit
Free Chrome extension by TPGi for visual accessibility testing and ARIA evaluation.
Pros
- ✓ Free Chrome extension
- ✓ Strong ARIA attribute evaluation
- ✓ Heading structure visualization
- ✓ Color contrast checker
Cons
- × Not a comprehensive scanner like WAVE or axe
- × Less well-known than competing tools
- × Manual testing only
- × No compliance reporting
Pricing: Free (Chrome extension)
Verdict: Strong complement to WAVE or axe for evaluating ARIA usage and heading structure. Not a standalone testing tool but useful for specific checks.
Found your pick?
Try A11yProof free — no setup fees, scanning in under 5 minutes.
What Free Gets You
Free accessibility scanners are legitimate testing tools built by respected organizations. WebAIM (WAVE), Deque (axe DevTools), Google (Lighthouse), and the open-source community (Pa11y) all provide tools that catch real WCAG violations at no cost.
The common thread: they all require manual, page-by-page testing. You load a page, run the scanner, review the results, then move to the next page. For a 5-page marketing site, this is manageable. For a 200-page ecommerce site, it is a full day of work that needs repeating after every content update.
Combining Free Tools
No single free tool catches everything. WAVE and axe DevTools use different rule sets and frequently flag different issues on the same page. Running both takes an extra 30 seconds per page and increases your detection coverage.
A practical free workflow: run Lighthouse for a quick score (takes 10 seconds), run axe DevTools for detailed developer-friendly results, then run WAVE for visual issue highlighting that helps you understand the user impact. Three tools, three minutes per page, better coverage than any one alone.
What Free Misses
Beyond the page-by-page limitation, all free tools share the gaps that all automated scanners share. They cannot evaluate whether alt text is actually meaningful. They cannot test whether keyboard navigation follows a logical flow. They cannot determine if error messages are helpful to screen reader users.
Automated scanning catches the 30-40% of WCAG criteria that are mechanically testable. The rest requires a human tester navigating the site with a keyboard and screen reader.
When to Upgrade
Free tools make sense when you are building a site and want to catch issues during development. They stop making sense when you need ongoing compliance monitoring across many pages, compliance documentation for legal protection, or fix suggestions that reduce remediation time.
We built A11yProof starting at $29/month to fill the gap between free page-by-page tools and enterprise platforms that cost $500+/month.
Q&A
What is the best free accessibility scanner?
WAVE for non-developers, axe DevTools for developers. Both are browser extensions that scan individual pages against WCAG criteria. Use them together for broader coverage since they use different rule sets and catch different issues.
Q&A
Can free tools replace paid accessibility scanners?
For small sites under 10 pages and development-time testing, free tools are effective. For ongoing compliance management of larger sites, free tools fall short: no automated site-wide scanning, no compliance reporting, no fix suggestions. Paid tools like A11yProof ($29/month) automate the repetitive work and generate documentation that free tools do not.
Q&A
What do free accessibility scanners miss?
All automated scanners, free and paid, miss approximately 60-70% of WCAG issues that require manual testing: keyboard navigation, screen reader flow, meaningful alt text quality, logical reading order, and focus management. Free tools additionally miss issues on pages you do not manually test, since they have no site-wide scanning.
Find a better way to handle accessibility
Are free accessibility scanners good enough for ADA compliance?
How many accessibility issues can automated free tools detect?
Should I use multiple free scanners together?
When should I upgrade from free tools to a paid scanner?
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