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Accessible Colors vs Contrast Ratio: catalog facts
Accessible Colors	Contrast Ratio
Free Used directly in the browser; the site mentions no pricing.	Free Free to use in the browser.
Web	Web
Checks against both WCAG AA and AAA levels Suggests the nearest passing colors instead of only failing a pair	Updates the ratio live as you type Handles semi-transparent colors with an error margin
Based on WCAG 2.0 contrast rules Limited to text and background color pairs	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
Not stated if an account is 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.