Compare software

Leonardo vs Harmonizer: catalog facts
Leonardo	Harmonizer
Free Free to use in the browser, with source published on GitHub.	Free Free to use in the browser.
Web	Web
Generates swatches from target contrast ratios Adaptive themes make dark mode variants quick	Uses OKLCH for perceptually even palettes Keeps contrast consistent across hues
Aimed at design systems work, more than a simple palette picker needs Contrast-driven approach takes some learning	Aimed at UI palettes rather than general color exploration Little documentation visible on the site
Web application	Web application
Open 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	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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