Olyx UI

50+ React components. Native CSS. No class soup.

Accessible, composable components built on Base UI with modern CSS and HCT color science. Copy, paste, and own your UI.

Documentation · Components · Get Started

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Why Olyx?

Most React component libraries style with Tailwind utilities. Your button ends up looking like this:

// ❌ Other libraries — CSS dump in your JSX
<button className="inline-flex items-center justify-center rounded-md text-sm
  font-medium ring-offset-background transition-colors focus-visible:outline-none
  focus-visible:ring-2 focus-visible:ring-ring disabled:pointer-events-none
  disabled:opacity-50 bg-primary text-primary-foreground hover:bg-primary/90
  h-10 px-4 py-2">
  Click me
</button>

Olyx keeps your markup clean. The styling lives in CSS where it belongs:

// ✅ Olyx — props, not class strings
<Button variant="primary" mode="filled" size="md">
  Click me
</Button>

/* Scoped by data attributes — readable, overridable, debuggable */
[data-ui="button"][data-mode="filled"] {
  background-color: var(--color-button);
  color: var(--color-on-button);
}

Quick Start

# Initialize Olyx in your project
npx olyx init

# Add components
npx olyx add button
npx olyx add button input dialog

Or copy component code directly from the docs.

Requirements

• React 19+
• TypeScript 5+ (recommended)

Architecture

Native CSS with Data Attributes

Every component uses data-* attributes for variant styling. No runtime CSS-in-JS, no utility class concatenation:

// Component outputs clean, semantic markup
<ButtonPrimitive
  data-ui="button"
  data-variant={variant}
  data-mode={mode}
  data-size={size}
  {...rest}
>
  {children}
</ButtonPrimitive>

CSS handles the visual logic using @layer, custom properties, and modern selectors:

@layer components {
  [data-ui="button"] {
    display: inline-flex;
    align-items: center;
    height: var(--button-size);
    transition: all var(--transition-expressive-fast-effects);
  }

  [data-ui="button"][data-size="md"] {
    --button-size: 36px;
    padding-inline: var(--spacing-12);
    border-radius: var(--radius-md);
  }
}

Base UI Foundation

Built on Base UI — the unstyled primitive layer from the MUI team. Every component inherits proper accessibility, keyboard navigation, and focus management out of the box.

HCT Color System

Colors powered by Google's HCT (Hue-Chroma-Tone) color space. Unlike RGB/HSL where "same lightness" doesn't mean "same perceived brightness," HCT is perceptually uniform. This means:

• Colors at the same tone level have identical perceived brightness
• Automatic dark mode palettes that maintain contrast ratios
• WCAG AA compliance built into the color math

Repository Structure

Monorepo managed with Turborepo:

olyx-ui/
├── apps/
│   └── web/              # Documentation site (Next.js 16, Fumadocs)
├── packages/
│   ├── react/            # @olyx/react — component library
│   ├── cli/              # CLI for copy-paste installation
│   └── config/           # Shared TypeScript configuration

Stack

Tool	Purpose
React 19	UI framework
Base UI	Accessible unstyled primitives
TypeScript	Type safety
Bun	Runtime & package manager
Biome	Linting & formatting
Turborepo	Monorepo builds
Fumadocs	Documentation framework

Local Development

git clone https://github.com/ramo4040/olyx-ui.git
cd olyx-ui
bun install

# Start all apps
bun dev

# Start docs site only
bun dev:web

# Lint & type check
bun lint
bun check-types

Contributing

Contributions welcome. See CONTRIBUTING.md for setup instructions and guidelines.

Whether it's bug reports, new components, documentation improvements, or accessibility fixes — all contributions are valued.

Roadmap

• 🎨 Figma design kit
• 🛠️ Theme generator / playground
• 🧩 More components
• 📦 Package size optimizations

License

MIT — use it however you want, commercially or otherwise.

Acknowledgements

• Base UI — Accessible primitives that form the foundation
• React — The UI library powering it all
• Fumadocs — Documentation framework
• Biome — Fast linting and formatting
• Bun — Runtime and package management

Connect

• Website — olyxui.com
• Docs — olyxui.com/docs
• GitHub — @ramo4040
• Twitter/X — @yassir_rouane
• LinkedIn — Yassir Rouane

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Built by Yassir Rouane