A tool to calculate the contrast ratio between any two valid CSS colors.
Develop, debug and test websites and apps twice as fast. Know for sure your sites and apps work everywhere and for everyone.
Get the web's modern capabilities on your own sites and apps with useful guidance and analysis from web.dev.
An accessibility visualization toolkit. tota11y helps visualize how your site performs with assistive technologies.
Test your website with simulated vision impairments.
Nibbler is a free tool for testing websites. Enter the address of any website and Nibbler will give you a report scoring the website out of 10 for key areas, including accessibility, SEO, social media and technology.
Alix allows you to lint your HTML for Accessibility issues simply by applying a stylesheet that makes use of advanced CSS selectors.
Web accessibility audits powered by the Chrome logo Chrome Accessibility Developer Tools.