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Leonardo vs ColorBrewer: catalog facts
Leonardo	ColorBrewer
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	Filters for colorblind safe, print and photocopy safe schemes Map preview with context layers
Aimed at design systems work, more than a simple palette picker needs Contrast-driven approach takes some learning	Limited to its curated set of schemes Interface is aimed at cartography rather than general design
Web application	Web application
Open source	Open 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 23, 2026

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