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APCA Contrast Calculator vs Contrast Finder: catalog facts
APCA Contrast Calculator	Contrast Finder
Free Free to use in the browser.	Free Free to use online and open source for self-hosting.
Web	Web, Self-hosted
Polarity aware, handling dark mode separately Shows contrast relative to font size and weight	Suggests valid colors close to the original Choose to adjust text or background color
APCA is not yet a published WCAG requirement Results are not the same as WCAG 2 contrast ratios	Checks one color pair at a time Focused only on contrast, not other accessibility criteria
Web application	Web application, Self-hosted
Closed source	Open source
License not stated	License: AGPL-3.0
No account needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 24, 2026

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