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Accessible Palette vs Atmos: catalog facts
Accessible Palette	Atmos
Free Free to use in the browser; no paid tier is mentioned on the page.	Freemium Free to start; an account login is offered for further use.
Web	Web
Consistent perceived lightness across hues Shows WCAG 2 and WCAG 3 contrast for each step	Uniform shade and scale generation Semantic status colors from a primary color
Assumes familiarity with LCh values Developer and export options are not described on the page	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
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.