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Leonardo vs Viz Palette: catalog facts
Leonardo	Viz Palette
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	Simulates several color vision deficiencies Flags colors that are hard to distinguish at different sizes
Aimed at design systems work, more than a simple palette picker needs Contrast-driven approach takes some learning	Focused on data visualization palettes only Does not generate palettes itself; links to other tools for that
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.