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Colour Contrast Checker vs APCA Contrast Calculator: catalog facts
Colour Contrast Checker	APCA Contrast Calculator
Free Free to use in the browser.	Free Free to use in the browser.
Web	Web
Clear AA and AAA pass or fail results Adjust colours with RGB or HSL sliders	Polarity aware, handling dark mode separately Shows contrast relative to font size and weight
Checks one colour pair at a time Licence of the published source is not stated in the research	APCA is not yet a published WCAG requirement Results are not the same as WCAG 2 contrast ratios
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	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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