Free Colour Blindness Tester

The free, fast, and fully browser-based colour blindness tester.

Check your designs for colour blindness in seconds — no downloads, no sign-up, just fast, accessible colour testing right in your browser.

Make your colours work for everyone with this free, browser-based tool — instantly see how your designs look to people with colour blindness.

Free online tool to test colour combinations for accessibility and contrast issues. Designed for web designers, developers, and content creators.