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Kontrast vs Color Review: catalog facts
Kontrast	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.
Linux	Web
Checks color combinations for readability and accessibility Available through Flathub and Linux package managers	Edit colors in hex, RGB, HSL, HSV or CMYK Live preview of body text and headlines
Linux only	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
Not stated if an account is needed	No account needed
Not stated if it 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.