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Theme UI: The Design Graph Framework

Theme UI is a library for creating themeable user interfaces based on constraint-based design principles. Build custom component libraries, design systems, web applications, Gatsby themes, and more with a flexible API for best-in-class developer ergonomics.

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  1. Create your theme

    export default {
      colors: {
        text: '#000',
        background: '#fff',
        primary: 'tomato',
      },
      fonts: {
        body: 'system-ui, sans-serif',
        heading: '"Avenir Next", sans-serif',
      },
    }

  2. Style your UI

    /** @jsx jsx */
    import { jsx } from 'theme-ui'
    export default props => (
      <h1
        sx={{
          color: 'primary',
          fontFamily: 'heading',
        }}>
        Hello
      </h1>
    )

  • Ergonomic

    Best-in-class developer ergonomics let you style your application quickly and consistently based on your theme

  • Themeable

    Quickly and easily reference values from your theme throughout your entire application, on any component

  • Constraint-based

    Use color, typography, and layout scales rooted in constraint-based design principles

  • “Looking into Theme UI and WHOA 🤯 it's everything I like from styled-system, leveraged into a less opinionated usage.”

    – Eka

  • “Feels like web development using cheat codes”

    – Richard George

  • “Theme UI is brilliant. Took me a little while to get into it but it’s super brill brills once you get going! 😎”

    – Paul Scanlon

  • “Took me approximately 5 minutes to fall in love with Theme UI, its sx prop gives you access to design tokens from a theme file automatically as well as the goodness of the css prop 🔥”

    – Kyle Gill

  • “Theme UI is absolutely brilliant. Things I was struggling with in styled-system (like mixing responsive and css props) are solved very elegantly + so much more.”

    – Bernhard Gschwantner

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