Validation Tools


CSS Validation


XHTML Validation


Note that none of these automated tools are a substitute for a comprehensive accessibility review. Many of the 508 and WCAG requirements are subjective and are difficult or impossible for a machine to assess. In the final analysis, only you and your visitors can determine if your site is truly accessible.

Possibly the most popular automated accessibility checker.

Cynthia Says
Another automated accessibility checker.

ColorBlind Web Page Filter
Test how your pages look to people with various forms of color-blindness.

Juicy Studio Color Contrast Analyzer
Another tool for testing color and contrast.


Web Accessibility Testing by Jim Thatcher