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WhoCanUse vs Contrast Ratio: catalog facts
WhoCanUse	Contrast Ratio
Free Free to use; the developer accepts GitHub sponsorships.	Free Free to use in the browser.
Web	Web
Previews each color blindness type and other vision conditions Shows share of people affected by each condition	Updates the ratio live as you type Handles semi-transparent colors with an error margin
Checks one color pair at a time Does not scan a live web page	Checks one color pair at a time The hosting page includes marketing content from Siege Media
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.