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Contraste vs Ratio: catalog facts
Contraste	Ratio
Free The app is available to download for free.	Free Free and open source under GPL-3.0-or-later.
macOS	macOS, Linux
Checks text and background color combinations against WCAG thresholds Runs on macOS High Sierra and newer	Checks text and non-text contrast criteria Supports a focus appearance criterion
Available only for macOS	Focused on WCAG criteria 1.4.3, 1.4.11, and 2.4.13
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 8, 2026

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