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Atmos vs Leonardo: catalog facts
Atmos	Leonardo
Freemium Free to start; an account login is offered for further use.	Free Free to use in the browser, with source published on GitHub.
Web	Web
Uniform shade and scale generation Semantic status colors from a primary color	Generates swatches from target contrast ratios Adaptive themes make dark mode variants quick
Browser only Some features may need an account	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
Not stated if an account is needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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