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WebAIM Contrast Checker vs Accessible Color Matrix: catalog facts
WebAIM Contrast Checker	Accessible Color Matrix
Free Free to use.	Free Free to use in the browser.
Web	Web
Separate results for normal text, large text and UI components Alpha and lightness controls for adjusting colors	Checks every color pairing in a palette at once Grid view makes passing and failing combinations easy to scan
Checks one color pair at a time Does not scan a live page	Focused only on contrast, with no palette generation Small single-purpose tool with limited documentation
Web application	Web application
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is 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 October 2, 2026

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