Website accessibility testing tools range from free browser extensions to enterprise platforms costing thousands per month. The right tool depends on your goal — a quick compliance check, developer testing during builds, or ongoing monitoring. This guide covers the most useful options in each category.
Automated tools can detect approximately 30-40% of WCAG violations — primarily issues with missing alt text, color contrast, form labels, and HTML structure. Manual testing by a human tester catches the remaining violations that require judgment: whether alt text is actually descriptive, whether the reading order makes sense, whether complex interactions work with screen readers. The most complete compliance picture combines automated scanning with periodic manual testing.
ADAWebPro provides a free automated WCAG 2.1 AA scan of your website that returns results in 60 seconds with no signup required. The report includes your violation count, ADA score, and a plain-English fix list prioritized by impact. This is the fastest way to get a baseline compliance snapshot for any website. Ongoing monitoring starts at $39/month to continuously scan for new violations as the site changes.
The axe DevTools browser extension from Deque is widely considered the gold standard for developer-facing accessibility testing. It runs against the currently loaded page and flags violations with code-level detail. The WAVE extension from WebAIM provides a visual overlay showing accessibility errors, alerts, and structural elements. Both are free for basic use. These tools are ideal during development to catch violations before pages go live.
Chrome DevTools has built-in accessibility features in the Elements panel — the Accessibility Tree shows how assistive technologies see your page structure. The Lighthouse audit (under the DevTools Audits tab) runs a comprehensive accessibility scan and scores the page 0-100. The color picker in DevTools includes a contrast ratio indicator that updates in real time as you adjust colors. These are free tools available in every Chrome installation.
Testing with actual screen readers is the most accurate way to understand how disabled users experience your website. NVDA (NonVisual Desktop Access) is a free Windows screen reader — downloading it and navigating your website with the screen only is the most revealing accessibility test you can do. JAWS is the most widely used professional screen reader (paid). VoiceOver is built into macOS and iOS. Even 30 minutes of screen reader testing reveals issues that automated tools completely miss.
Enterprise accessibility platforms offer continuous monitoring, detailed reporting, workflow integrations, and manual testing services. Siteimprove and Level Access start at several hundred dollars per month and scale up significantly for large sites. These platforms are designed for large organizations with dedicated accessibility teams. For small and mid-size businesses, automated scanning through ADAWebPro combined with periodic developer testing provides strong protection at a fraction of the cost.
Free WCAG 2.1 AA scan. 60 seconds. No signup required.
Free WCAG 2.1 AA scan. Results in 60 seconds. No signup required.