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Contrast Ratio vs Accessible Colors: catalog facts
Contrast Ratio	Accessible Colors
Free Free to use in the browser.	Free Used directly in the browser; the site mentions no pricing.
Web	Web
Updates the ratio live as you type Handles semi-transparent colors with an error margin	Checks against both WCAG AA and AAA levels Suggests the nearest passing colors instead of only failing a pair
Checks one color pair at a time The hosting page includes marketing content from Siege Media	Based on WCAG 2.0 contrast rules Limited to text and background color pairs
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 September 24, 2026

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