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Colour Contrast Analyser vs APCA Contrast Calculator: catalog facts
Colour Contrast Analyser	APCA Contrast Calculator
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	Polarity aware, handling dark mode separately Shows contrast relative to font size and weight
Windows and macOS only Checks one color pair at a time	APCA is not yet a published WCAG requirement Results are not the same as WCAG 2 contrast ratios
Downloadable app	Web application
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	No account needed
Works offline	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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