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Leonardo vs Data Color Picker: catalog facts
Leonardo	Data Color Picker
Free Free to use in the browser, with source published on GitHub.	Free Free web tool from Learn UI Design, which also sells design courses.
Web	Web
Generates swatches from target contrast ratios Adaptive themes make dark mode variants quick	Palette, single-hue and divergent modes Preview on light or dark backgrounds
Aimed at design systems work, more than a simple palette picker needs Contrast-driven approach takes some learning	Limited to eight colors per palette Focused on data visualization rather than general UI palettes
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	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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