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Color Review vs Kontrast: catalog facts
Color Review	Kontrast
Free Free to use in the browser with no paid tier shown.	Free Free and open source under GPL-3.0-or-later.
Web	Linux
Edit colors in hex, RGB, HSL, HSV or CMYK Live preview of body text and headlines	Checks color combinations for readability and accessibility Available through Flathub and Linux package managers
Checks one color pair at a time Requires a browser and connection	Linux only
Web application	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
No account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 8, 2026

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