Web Accessibility Checkers
Out-of-the-Box Testing Tools
Accessibile Color Palette Evaluator
This free service from NC State will allow you to build a color palette and evaluate all of the possible color combinations in a palette to see which are accessible and which are not.
This free online tool checks for a number of accessibility errors. The errors are based on the source code of the Web page.
Chrome extension – automated tool to find Accessibility defects on your web site.
Firefox add-in – automated tool to find Accessibility defects on your web site.
Color Contrast Analyzer for Google Chrome
This is a free Chrome extension from NC State that allows you to check for WCAG color contrast problems.
Color Contrast Checker from WebAim
Contrast Analyser for Windows and Mac
This free desktop-based tool from The Paciello Group tests for color contrast. It lets you pick any two colors from your desktop, including Web browsers, and see if they provide enough color contrast to be accessible.
Jim Thatcher Favelets
This free set of browser-based tools from Jim Thatcher will test for numerous accessibility features and errors. These extensions will work in any browser. The errors are based on the rendered page (DOM), not the source code.
JuicyStudio Accessibility Toolbar
This free tool is a Firefox plugin that will test for color contrast, plus reveal info
Firefox Accessibility Extension
This free toolbar from the University of Illinois works with Firefox. It reports on accessibility features and errors for pages. This tool can check password-protected pages.
Functional Accessibility Evaluator
This free online tool from the University of Illinois checks for a number of accessibility features and errors. The reports are organized functional evaluations, meaning they organize results by how users interact with the page. This tool cannot check password-protected pages.
Grackle Docs is an accessibility checker for the Google suite of products and gives creators the option to export their accessible Google Docs file as an accessible PDF document. the product can scan Google Docs and PDF files in google Drive and check for accessibility errors
IDI Web Accessibility Checker
Photosensitive Epilepsy Analysis Tool
The Trace Center’s Photosensitive Epilepsy Analysis Tool (PEAT) is a free, downloadable resource for developers to identify seizure risks in their web content and software.
The tool is available as a desktop application for Mac or Windows, and is also available as a web application – http://www.powermapper.com/products/ondemand/
Tenon Accessibility Checker
Vischeck is a way of showing you what things look like to someone who is color blind. You can try Vischeck online- either run Vischeck on your own image files or run Vischeck on a web page. You can also download programs to let you run it on your own computer.
This free service from the W3C will check the validity of your code based on the doctype used.
WAVE Extensions for Chrome and Firefox
A web accessibility evaluation tool developed by WebAIM.org.
Web Accessibility Toolbar for IE
This free browser-based tool from The Paciello Group tests for numerous accessibility errors. It works within Internet Explorer. It can test password protected Web pages.
Web Evaluation Tools Bookmarklet
This free tool from NC State will reveal several accessibility features of Web Sites. It will reveal heading structure, ARIA landmarks and their labels, ARIA roles and attributes, tabindex attributes, and internal links. It will also allow you to force the visual keyboard focus to always be seen. This tool is helpful primarily for determining if a feature has been implemented correctly. This tool works in any browser.
Screen readers should not be your first tool for testing for accessibility. Screen readers are specialized pieces of software that have a steep learning curve to use effectively. Designing to standards and using other tools to confirm that the UI has been implemented accessibly should be used instead.
Additionally, just because something works with a screen reader does not mean it is accessible with all types of assistive technology and for people with other types of disabilities.
However, there are times when a screen reader is necessary for testing. This is usually when you are implementing non-standard controls and using ARIA. If you do need to use a screen reader, these are your main options
Fangs Screen Reader Emulator
Renders a text version of your page similar to what a screen reader would output.
A Windows based screen reader that is considered the most robust for Web accessibility support. While JAWS is powerful, it has a very heavy imprint on your system. JAWS works best with Internet Explorer or Firefox.
A Windows based free and open source screen reader that is quite capable at Web accessibility. NVDA is a light-weight option that is easy to start up. It works best with Firefox.
Thunder is a free screenreader talking software for users with little or no sight. It works well with Windows 7, Vista or XP.
A free Chrome based screen reader which is available as an extension to the Chrome browser.
A free OS X and iOS based screen reader that ships with OS X and iOS. For Web accessibility, VoiceOver works best with Safari.