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Colour Contrast Analyser vs WhoCanUse: catalog facts
Colour Contrast Analyser	WhoCanUse
Free Free to download, with source code published on GitHub.	Free Free to use; the developer accepts GitHub sponsorships.
Windows, macOS	Web
Screen-wide eyedropper for foreground and background Results for WCAG 2.0, 2.1 and 2.2	Previews each color blindness type and other vision conditions Shows share of people affected by each condition
Windows and macOS only Checks one color pair at a time	Checks one color pair at a time Does not scan a live web page
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.