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Viz Palette vs Leonardo: catalog facts
Viz Palette	Leonardo
Free Free to use in the browser.	Free Free to use in the browser, with source published on GitHub.
Web	Web
Simulates several color vision deficiencies Flags colors that are hard to distinguish at different sizes	Generates swatches from target contrast ratios Adaptive themes make dark mode variants quick
Focused on data visualization palettes only Does not generate palettes itself; links to other tools for that	Aimed at design systems work, more than a simple palette picker needs Contrast-driven approach takes some learning
Web application	Web application
Closed source	Open source
License not stated	License not stated
No account needed	Not stated if an account is needed
Needs internet	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.