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Kontrast vs Ratio: catalog facts
Kontrast	Ratio
Free Free and open source under GPL-3.0-or-later.	Free Free and open source under GPL-3.0-or-later.
Linux	macOS, Linux
Checks color combinations for readability and accessibility Available through Flathub and Linux package managers	Checks text and non-text contrast criteria Supports a focus appearance criterion
Linux only	Focused on WCAG criteria 1.4.3, 1.4.11, and 2.4.13
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0-or-later
Not stated if an account is needed	No account needed
Not stated if it 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.