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Ratio vs Color Review: catalog facts
Ratio	Color Review
Free Free and open source under GPL-3.0-or-later.	Free Free to use in the browser with no paid tier shown.
macOS, Linux	Web
Checks text and non-text contrast criteria Supports a focus appearance criterion	Edit colors in hex, RGB, HSL, HSV or CMYK Live preview of body text and headlines
Focused on WCAG criteria 1.4.3, 1.4.11, and 2.4.13	Checks one color pair at a time Requires a browser and connection
Downloadable app	Web application
Open source	Closed source
License: GPL-3.0-or-later	License not stated
No account needed	No account needed
Works offline	Needs internet
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 1, 2026

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