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