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Ratio vs Contraste: catalog facts
Ratio	Contraste
Free Free and open source under GPL-3.0-or-later.	Free The app is available to download for free.
macOS, Linux	macOS
Checks text and non-text contrast criteria Supports a focus appearance criterion	Checks text and background color combinations against WCAG thresholds Runs on macOS High Sierra and newer
Focused on WCAG criteria 1.4.3, 1.4.11, and 2.4.13	Available only for macOS
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-or-later	License not stated
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.