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Contrast Finder vs WhoCanUse: catalog facts
Contrast Finder	WhoCanUse
Free Free to use online and open source for self-hosting.	Free Free to use; the developer accepts GitHub sponsorships.
Web, Self-hosted	Web
Suggests valid colors close to the original Choose to adjust text or background color	Previews each color blindness type and other vision conditions Shows share of people affected by each condition
Checks one color pair at a time Focused only on contrast, not other accessibility criteria	Checks one color pair at a time Does not scan a live web page
Web application, Self-hosted	Web application
Open source	Closed source
License: AGPL-3.0	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 24, 2026	Official website Full listing and sources Checked September 23, 2026

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