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