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Colour Contrast Analyser vs Sip: catalog facts
Colour Contrast Analyser	Sip
Free Free to download, with source code published on GitHub.	Paid Paid app with a free trial that needs no credit card.
Windows, macOS	macOS
Screen-wide eyedropper for foreground and background Results for WCAG 2.0, 2.1 and 2.2	Fast on-screen picking with keyboard shortcuts Palette organization with descriptions
Windows and macOS only Checks one color pair at a time	macOS only Paid after the trial
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License not stated
No account needed	Not stated if an account is 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.