Compare software

APCA Contrast Calculator vs Colour Contrast Analyser: catalog facts
APCA Contrast Calculator	Colour Contrast Analyser
Free Free to use in the browser.	Free Free to download, with source code published on GitHub.
Web	Windows, macOS
Polarity aware, handling dark mode separately Shows contrast relative to font size and weight	Screen-wide eyedropper for foreground and background Results for WCAG 2.0, 2.1 and 2.2
APCA is not yet a published WCAG requirement Results are not the same as WCAG 2 contrast ratios	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
Needs internet	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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