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Kontrast vs Contraste: catalog facts
Kontrast	Contraste
Free Free and open source under GPL-3.0-or-later.	Free The app is available to download for free.
Linux	macOS
Checks color combinations for readability and accessibility Available through Flathub and Linux package managers	Checks text and background color combinations against WCAG thresholds Runs on macOS High Sierra and newer
Linux only	Available only for macOS
Downloadable app	Downloadable app
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	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.