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Leonardo vs HCL Wizard: catalog facts
Leonardo	HCL Wizard
Free Free to use in the browser, with source published on GitHub.	Free Used directly in the browser; no pricing is mentioned.
Web	Web
Generates swatches from target contrast ratios Adaptive themes make dark mode variants quick	Perception-based HCL color space Color vision deficiency emulator for checking figures
Aimed at design systems work, more than a simple palette picker needs Contrast-driven approach takes some learning	Aimed at data visualization more than general design Assumes some familiarity with color space concepts
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 24, 2026

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