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Leonardo vs Chroma.js Color Palette Helper: catalog facts
Leonardo	Chroma.js Color Palette Helper
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	Focuses on perceptually balanced color steps Checks palettes for colorblind safety
Aimed at design systems work, more than a simple palette picker needs Contrast-driven approach takes some learning	Specialised for data visualization rather than UI themes Plain interface with little guidance
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 23, 2026

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