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Scale vs Leonardo: catalog facts
Scale	Leonardo
Best for: Designers building tint and shade scales for a UI color system	Best for: Designers and developers building accessible color systems for interfaces and charts
Free Free to use in the browser.	Free Free to use in the browser, with source published on GitHub.
Web	Web
Builds a full scale from one base color Adjustable hue and saturation curves across the scale All 3 strengths for Scale Builds a full scale from one base color Adjustable hue and saturation curves across the scale Runs in the browser with nothing to install	Generates swatches from target contrast ratios Adaptive themes make dark mode variants quick All 4 strengths for Leonardo Generates swatches from target contrast ratios Adaptive themes make dark mode variants quick Exports CSS custom properties, Design Tokens and SVG Separate tools for data visualization scales
Focused on scales only, not full multi-color palettes Little documentation on the page itself	Aimed at design systems work, more than a simple palette picker needs Contrast-driven approach takes some learning
Web application	Web application
Not open source	Open source
License not stated	License not stated
Not stated if an account is 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 Sources for Scale hihayk.github.io/scale Catalog checked September 24, 2026	Official website Full listing and sources Sources for Leonardo leonardocolor.io Catalog checked September 23, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.