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Colour Contrast Checker vs WebAIM Contrast Checker: catalog facts
Colour Contrast Checker	WebAIM Contrast Checker
Free Free to use in the browser.	Free Free to use.
Web	Web
Clear AA and AAA pass or fail results Adjust colours with RGB or HSL sliders	Separate results for normal text, large text and UI components Alpha and lightness controls for adjusting colors
Checks one colour pair at a time Licence of the published source is not stated in the research	Checks one color pair at a time Does not scan a live page
Web application	Web application
Closed source	Closed source
License not stated	License not stated
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.