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Install

npm install @devup-ui/react

# on next.js
npm install @devup-ui/next-plugin

# on vite
npm install @devup-ui/vite-plugin

# on rsbuild
npm install @devup-ui/rsbuild-plugin

# on webpack
npm install @devup-ui/webpack-plugin

Features

• Preprocessor
• Zero Config
• Zero FOUC
• Zero Runtime
• RSC Support
• Must not use JavaScript, client-side logic, or hybrid solutions
• Support Library mode
• Zero Cost Dynamic Theme Support based on CSS Variables
• Theme with Typing
• Smallest size, fastest speed

Inspirations

• Styled System
• Chakra UI
• Theme UI
• Vanilla Extract
• Rainbow Sprinkles
• Kuma UI

Comparison Benchmarks

Next.js Build Time and Build Size (github action - ubuntu-latest)

| Library | Version | Build Time | Build Size | | ---------------------- | ------- | ---------- | ----------------- | | tailwindcss | 4.1.13 | 20.22s | 57,415,796 bytes | | styleX | 0.15.4 | 38.97s | 76,257,820 bytes | | vanilla-extract | 1.17.4 | 20.09s | 59,366,237 bytes | | kuma-ui | 1.5.9 | 21.61s | 67,422,085 bytes | | panda-css | 1.3.1 | 22.01s | 62,431,065 bytes | | chakra-ui | 3.27.0 | 29.99s | 210,122,493 bytes | | mui | 7.3.2 | 22.21s | 94,231,958 bytes | | devup-ui(per-file css) | 1.0.18 | 18.23s | 57,440,953 bytes | | devup-ui(single css) | 1.0.18 | 18.35s | 57,409,008 bytes |

How it works

Devup UI is a CSS in JS preprocessor that does not require runtime. Devup UI eliminates the performance degradation of the browser through the CSS in JS preprocessor. We develop a preprocessor that considers all grammatical cases.

const before = <Box bg="red" />

const after = <div className="d0" />

Variables are fully supported.

const before = <Box bg={colorVariable} />

const after = (
  <div
    className="d0"
    style={{
      '--d0': colorVariable,
    }}
  />
)

Various expressions and responsiveness are also fully supported.

const before = <Box bg={['red', 'blue', a > b ? 'yellow' : variable]} />

const after = (
  <div
    className={`d0 d1 ${a > b ? 'd2' : 'd3'}`}
    style={{
      '--d2': variable,
    }}
  />
)

Support Theme with Typing

devup.json

{
  "theme": {
    "colors": {
      "default": {
        "text": "#000"
      },
      "dark": {
        "text": "white"
      }
    }
  }
}

// Type Safe
<Text color="$text" />

Support Responsive And Pseudo Selector

You can use responsive and pseudo selector.

// Responsive with Selector
const box = <Box _hover={{ bg: ['red', 'blue'] }} />

// Same
const box = <Box _hover={[{ bg: 'red' }, { bg: 'blue' }]} />