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Leonardo vs Material Theme Builder: catalog facts
Leonardo	Material Theme Builder
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	Builds a full Material Design 3 scheme from one color Official tool from the makers of the design system
Aimed at design systems work, more than a simple palette picker needs Contrast-driven approach takes some learning	Only useful for projects following Material Design 3 Little information beyond the tool itself on the page
Web application	Web application
Open source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is 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.