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ColorBox vs Leonardo: catalog facts
ColorBox	Leonardo
Free Free to use in the browser; no paid tier is shown on the page.	Free Free to use in the browser, with source published on GitHub.
Web	Web
Fine control over each channel with easing curves Shows contrast ratios for every step	Generates swatches from target contrast ratios Adaptive themes make dark mode variants quick
Curve-based controls take some learning Aimed at systematic scales rather than quick inspiration	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
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
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.