Accessibility Testing Tools

This is a collection of useful tools for accessibility testing and debugging. The earlier in the process you start using these, the better.

See also the accessibility section of my frontend-dev-bookmarks(link is external) which contains many more resources.

Mac

• Accessibility Inspector for Mac: https://developer.apple.com/library/mac/documentation/Accessibility/Conceptual/AccessibilityMacOSX/OSXAXTestingApps.html(link is external)
• VoiceOver for Mac: http://www.apple.com/accessibility/osx/voiceover/(link is external)

Windows

• The Accessibility Viewer (aViewer) for Windows: http://www.paciellogroup.com/resources/aviewer/(link is external)
• NVDA for Windows: http://www.nvaccess.org/download/(link is external)
• JAWS for Windows: http://www.freedomscientific.com/Downloads/JAWS(link is external)
• Up and Running with JAWS: https://joe-watkins.io/accessibility/up-and-running-with-jaws-on-a-mac/(link is external)

CSS Diagnostics

• Diagnostic.css: http://www.karlgroves.com/2013/09/07/diagnostic-css-super-quick-web-accessibility-testing/(link is external)
• debugCSS: http://yahoo.github.io/debugCSS/(link is external)
• AcceCSS Sass mixin: http://lukyvj.github.io/accecss/(link is external)

Browser extensions (Chrome)

• The Accessibility DevTools extension for Chrome: https://chrome.google.com/webstore/detail/accessibility-developer-t/fpkknkljclfencbdbgkenhalefipecmb(link is external)
• WAVE Evaluation Tool for Chrome: https://chrome.google.com/webstore/detail/wave-evaluation-tool/jbbplnpkjmmeebjpijfedlgcdilocofh(link is external)
• ChromeVox for Chrome: https://chrome.google.com/webstore/detail/chromevox/kgejglhpjiefppelpmljglcjbhoiplfn(link is external)
• aXe for Chrome: https://chrome.google.com/webstore/detail/axe/lhdoppojpmngadmnindnejefpokejbdd(link is external)
• Color Contrast Analyzer for Chrome: https://chrome.google.com/webstore/detail/color-contrast-analyzer/dagdlcijhfbmgkjokkjicnnfimlebcll/related(link is external)
• Siteimprove Accessibility Checker for Chrome: https://chrome.google.com/webstore/detail/siteimprove-accessibility/efcfolpjihicnikpmhnmphjhhpiclljc/(link is external)
• TRAY Readability tool: https://chrome.google.com/webstore/detail/tray-readability-tool/eccbjfaplogblgjpopbihpgfgmlgjamf(link is external)
• Funkify - disability simulator: http://www.funkify.org/(link is external)

Browser extensions (Firefox)

• Accessibility Evaluation Toolbar for Firefox: https://addons.mozilla.org/en-US/firefox/addon/accessibility-evaluation-toolb/(link is external)
• DOM Inspector for Firefox: https://addons.mozilla.org/en-US/firefox/addon/dom-inspector-6622/(link is external)
• Juicy Studio Accessibility Toolbar for Firefox: https://addons.mozilla.org/en-US/firefox/addon/juicy-studio-accessibility-too/(link is external)
• WAVE Accessibility Extension for Firefox: https://addons.mozilla.org/en-US/firefox/addon/wave-accessibility-tool/(link is external)

See the full accessibility tree in Chrome

You can view a dump of the accessibility tree in Chrome by typing chrome://accessibility/ in the address bar.

Online tools

• Tenon: https://tenon.io/(link is external)
• HTML_CodeSniffer: http://www.squizlabs.com/general/html-codesniffer(link is external)
• AccessLint: http://www.accesslint.com/(link is external)

Color Contrast Checkers

• Contrast Ratio: http://leaverou.github.io/contrast-ratio/(link is external)
• Color Contrast Checker: http://webaim.org/resources/contrastchecker/(link is external)
• Color Safe: http://colorsafe.co/(link is external)

Automated Accessibility Testing

• aXe, accessibility engine for automated Web UI testing: https://github.com/dequelabs/axe-core(link is external)
• tota11y, an accessibility visualization toolkit: http://khan.github.io/tota11y/(link is external)
• Pa11y: http://pa11y.org/(link is external)
• accessibilityjs - accessibility error scanner: https://github.com/github/accessibilityjs(link is external)

Bookmarklets

• The Visual ARIA Bookmarklet: http://whatsock.com/training/matrices/visual-aria.htm(link is external)
• Revenge.css: http://heydonworks.com/revenge_css_bookmarklet/(link is external)
• Bookmarklets for Accessibility Testing: http://pauljadam.com/bookmarklets/(link is external)
• a11y.css: http://ffoodd.github.io/a11y.css/(link is external)

Miscellaneous links

• Accessibility Testing Tools: http://www.paciellogroup.com/blog/2014/10/accessibility-testing-tools-updated/(link is external)
• Screen Reader User Survey 6 Results: http://webaim.org/projects/screenreadersurvey6/(link is external)
• Web Accessibility Evaluation Tools List (by W3C): https://www.w3.org/WAI/ER/tools/(link is external)
• Easy Checks - A First Review of Web Accessibility: https://www.w3.org/WAI/eval/preliminary(link is external)