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ColorBox vs UI Colors: catalog facts
ColorBox	UI Colors
Free Free to use in the browser; no paid tier is shown on the page.	Freemium Free to use, with a paid Pro upgrade that unlocks extra options.
Web	Web
Fine control over each channel with easing curves Shows contrast ratios for every step	Generates full Tailwind shade scales from one color Previews palettes on realistic UI examples and shadcn/ui components
Curve-based controls take some learning Aimed at systematic scales rather than quick inspiration	Some features require a Pro subscription Focused on Tailwind CSS naming and scales
Web application	Web application
Closed source	Closed source
License not stated	License not stated
No account needed	No account 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 23, 2026

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