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