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