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UI Colors vs Leonardo: catalog facts
UI Colors	Leonardo
Freemium Free to use, with a paid Pro upgrade that unlocks extra options.	Free Free to use in the browser, with source published on GitHub.
Web	Web
Generates full Tailwind shade scales from one color Previews palettes on realistic UI examples and shadcn/ui components	Generates swatches from target contrast ratios Adaptive themes make dark mode variants quick
Some features require a Pro subscription Focused on Tailwind CSS naming and scales	Aimed at design systems work, more than a simple palette picker needs Contrast-driven approach takes some learning
Web application	Web application
Closed source	Open source
License not stated	License not stated
No account needed	Not stated if an account is needed
Needs internet	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.