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Contrast Ratio vs Colour Contrast Analyser: catalog facts
Contrast Ratio	Colour Contrast Analyser
Free Free to use in the browser.	Free Free to download, with source code published on GitHub.
Web	Windows, macOS
Updates the ratio live as you type Handles semi-transparent colors with an error margin	Screen-wide eyedropper for foreground and background Results for WCAG 2.0, 2.1 and 2.2
Checks one color pair at a time The hosting page includes marketing content from Siege Media	Windows and macOS only Checks one color pair at a time
Web application	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.