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Harmonizer vs Pinwheel: catalog facts
Harmonizer	Pinwheel
Free Free to use in the browser.	Paid $9 USD plus tax, with a 30-day free trial.
Web	macOS
Uses OKLCH for perceptually even palettes Keeps contrast consistent across hues	OKLCH and OKLAB gradients without muddy midpoints Automated contrast testing
Aimed at UI palettes rather than general color exploration Little documentation visible on the site	macOS 15 or later only Paid after the trial
Web application	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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