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Contrast Ratio vs Contraste: catalog facts
Contrast Ratio	Contraste
Free Free to use in the browser.	Free The app is available to download for free.
Web	macOS
Updates the ratio live as you type Handles semi-transparent colors with an error margin	Checks text and background color combinations against WCAG thresholds Runs on macOS High Sierra and newer
Checks one color pair at a time The hosting page includes marketing content from Siege Media	Available only for macOS
Web application	Downloadable app
Closed source	Closed source
License not stated	License not stated
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 8, 2026

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