Choosing an accessibility testing tool shouldn't require a week of research. But with dozens of options — free browser extensions, enterprise platforms, open source libraries, and everything in between — it's hard to know what actually fits your workflow.
Here's an honest comparison of the major tools, tested against real-world projects.
What to look for
Before comparing tools, these are the criteria that matter:
- WCAG coverage — Does it test 2.0, 2.1, or 2.2? At which level (A, AA, AAA)?
- Automated vs manual — How many checks are automated? Does it guide manual checks?
- Integration — CI/CD, IDE, design tools?
- Fix guidance — Does it flag issues or tell you how to fix them?
- Authenticated pages — Can it scan behind login?
- Price — Free tier? Per-seat? Enterprise contracts?
axe DevTools (by Deque)
The most widely used accessibility engine. The core axe-core library is open source and powers many other tools.
Strengths: Excellent rule accuracy with very few false positives. Open source core you can embed in unit tests and CI/CD. Large community and strong documentation. Free Chrome and Firefox extensions.
Limitations: Free extension only runs automated checks. Advanced features (guided testing, dashboard, reporting) require paid licences. Accessibility only — no SEO, performance, or security. No AI-powered fix suggestions.
Best for: Developers embedding a reliable engine in automated test suites.
Pricing: Free (open source core), paid for Pro and Enterprise.
WAVE (by WebAIM)
A free tool from WebAIM, the non-profit behind many accessibility resources.
Strengths: Completely free. Visual inline overlays showing issues on the page. Includes contrast checking and structural analysis. Trusted for over 20 years.
Limitations: No API for CI/CD. One page at a time. No fix suggestions beyond general guidance. Results can be noisy. No authenticated page support.
Best for: Quick manual spot-checks during development.
Pricing: Free.
Lighthouse (by Google)
Built into Chrome DevTools. Runs accessibility alongside performance, SEO, and best practices.
Strengths: Free and built into every Chrome browser. Covers accessibility, performance, SEO, and best practices. Widely understood scores. CI/CD integration via Lighthouse CI.
Limitations: Accessibility checks use a subset of axe-core rules. No guided manual testing. Single page only. Results can vary between runs.
Best for: Quick audits. Performance-focused teams that want accessibility as a secondary check.
Pricing: Free.
Siteimprove
An enterprise platform covering accessibility, SEO, analytics, and content quality.
Strengths: Comprehensive site-wide scanning with scheduling. Strong compliance reporting. Content quality analysis included. Dedicated customer success.
Limitations: Enterprise pricing. Not practical for small teams. Heavier onboarding. Limited developer integrations.
Best for: Large organisations with dedicated compliance teams and enterprise budgets.
Pricing: Custom enterprise pricing.
Pa11y
An open source command-line accessibility testing tool.
Strengths: Free and open source. Simple CLI — easy to add to CI/CD. Supports multiple runners (axe, HTML_CodeSniffer). Can test authenticated pages.
Limitations: CLI only. No dashboard or reporting. Requires technical setup. Community-maintained with slower update cycles.
Best for: Developers who want a lightweight, free CI/CD check.
Pricing: Free (open source).
Blyxo
An all-in-one audit platform testing accessibility, SEO, performance, security, and AI discoverability in one scan.
Strengths: Five audit types in one scan. AI-powered fix suggestions with code snippets. Scans behind authentication via recorded flows. Screen reader simulation and WCAG coverage reports with manual test steps. 50+ training modules. REST API, Chrome extension, VS Code extension, Figma plugin, Jira integration. Free Starter tier with no time limit.
Limitations: Newer platform with a smaller community. AEO scoring is a unique category without direct benchmarks. Enterprise features require paid plans.
Best for: Teams wanting one tool for accessibility, SEO, performance, and AI discoverability.
Pricing: Free Starter (10 pages/scan), Professional $99/month (100 pages, 100 AI tokens), custom Enterprise.
Side-by-side comparison
| Feature | axe | WAVE | Lighthouse | Siteimprove | Pa11y | Blyxo |
|---|---|---|---|---|---|---|
| WCAG 2.2 | Yes | Yes | Partial | Yes | Yes | Yes |
| AI fix suggestions | No | No | No | No | No | Yes |
| SEO testing | No | No | Basic | Yes | No | Yes |
| Performance testing | No | No | Yes | No | No | Yes |
| Auth page scanning | Paid | No | No | Yes | Yes | Yes |
| CI/CD integration | Yes | No | Yes | Limited | Yes | Yes |
| Chrome extension | Yes | Yes | Built-in | Yes | No | Yes |
| VS Code extension | No | No | No | No | No | Yes |
| Figma plugin | No | No | No | No | No | Yes |
| Training modules | No | No | No | Yes | No | Yes |
| Free tier | Yes | Yes | Yes | No | Yes | Yes |
Which should you pick?
- Just starting? WAVE or Lighthouse to learn the basics.
- Need CI/CD automation? axe-core or Pa11y for pipeline checks.
- Enterprise compliance? Siteimprove has the reporting infrastructure.
- Want one tool for everything? Blyxo covers accessibility, SEO, performance, security, and AI discoverability.
- Zero budget? Lighthouse + Pa11y + WAVE cover a lot for free.
The best approach for most teams: a fast automated check in CI/CD plus a comprehensive periodic audit tool. Automated checks catch regressions. Periodic audits catch the deeper issues automation misses.
What accessibility tools does your team use? We're curious whether anyone's found a setup that covers both automated CI/CD checks and manual testing without needing three different subscriptions.
Ready to improve your website's accessibility?
Blyxo helps teams find and fix accessibility issues with AI-powered testing and developer-friendly recommendations.