system-ui

theme-ui

Build consistent, themeable React apps based on constraint-based design principles

5.4k stars664 forks41 watchers46 open issuesTypeScriptMIT

EDITOR'S TAKE

Theme tokens spec for React — colors, spacing, typography as a single config. Older but the underlying idea (design tokens) still matters. Worth knowing the pattern even if you build tokens yourself with CSS variables.

Use this if

You want a tested theme-token pattern and a community spec to align around.

Skip if

You are using shadcn or Tailwind — they have their own token systems.