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Leonardo vs ColorBox: catalog facts
Leonardo	ColorBox
Free Free to use in the browser, with source published on GitHub.	Free Free to use in the browser; no paid tier is shown on the page.
Web	Web
Generates swatches from target contrast ratios Adaptive themes make dark mode variants quick	Fine control over each channel with easing curves Shows contrast ratios for every step
Aimed at design systems work, more than a simple palette picker needs Contrast-driven approach takes some learning	Curve-based controls take some learning Aimed at systematic scales rather than quick inspiration
Web application	Web application
Open source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account 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.