Open Color is a free, open-source color scheme built specifically for UI use, 13 color families with 10 shades each, optimized for legibility and accessibility rather than aesthetic variety.
It exports to an unusually wide range of formats, CSS, Sass, Less, Tailwind, Sketch, TypeScript, and more, so the same palette drops into almost any tool or codebase without manual conversion.
Developers wanting a ready-made, MIT-licensed UI color system to adopt directly rather than building one from scratch, especially across a mixed toolchain.
Each color family has 10 numbered shades (0-9, lightest to darkest), a consistent structure worth adopting as a naming convention even if only some of the actual colors get used.
