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UI Colors vs Atmos: catalog facts
UI Colors	Atmos
Freemium Free to use, with a paid Pro upgrade that unlocks extra options.	Freemium Free to start; an account login is offered for further use.
Web	Web
Generates full Tailwind shade scales from one color Previews palettes on realistic UI examples and shadcn/ui components	Uniform shade and scale generation Semantic status colors from a primary color
Some features require a Pro subscription Focused on Tailwind CSS naming and scales	Browser only Some features may need an account
Web application	Web application
Closed source	Closed source
License not stated	License not stated
No account needed	Not stated if an account is needed
Needs internet	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.