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