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Leonardo vs Atmos: catalog facts
Leonardo	Atmos
Free Free to use in the browser, with source published on GitHub.	Freemium Free to start; an account login is offered for further use.
Web	Web
Generates swatches from target contrast ratios Adaptive themes make dark mode variants quick	Uniform shade and scale generation Semantic status colors from a primary color
Aimed at design systems work, more than a simple palette picker needs Contrast-driven approach takes some learning	Browser only Some features may need an account
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	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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