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