# Ultracite

**A production-grade, zero-configuration preset for ESLint, Biome, and Oxlint.**

Ultracite is designed to help you and your AI models write consistent and type-safe code without the hassle of configuration. Choose your preferred toolchain and get started in seconds.

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  <img src="https://img.shields.io/npm/dy/ultracite" alt="" />
  <img src="https://img.shields.io/npm/v/ultracite" alt="" />
  <img src="https://img.shields.io/github/license/haydenbleasel/ultracite" alt="" />
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## Quick Start

```sh
npx ultracite init
```

The interactive setup will guide you through selecting your formatter/linter, framework, editor, and AI agents.
It can also offer to install the reusable Ultracite skill, or you can pass `--install-skill` in non-interactive flows.

## Supported Tools

- **Biome** — All-in-one formatting and linting
- **ESLint + Prettier + Stylelint** — Most mature ecosystem with the largest plugin support
- **Oxlint + Oxfmt** — 50-100x faster than ESLint, part of the Oxc ecosystem

## Key Features

### ⚡ Subsecond Performance

Built on Rust-based tools for instant code analysis. On-save checks feel seamless without interrupting your workflow.

### 🎯 Zero-Config by Design

Hundreds of preconfigured rules optimized for JavaScript and TypeScript projects. Customize when needed, but it works perfectly out of the box.

### 🤖 AI-Ready

Generate rules for 40+ AI agents including Claude Code, GitHub Copilot, Cursor, Gemini, and more. Ensures consistent code style across all team members and AI models.

### 🏗️ Monorepo Ready

Unified toolchain configuration across all packages and apps, eliminating duplicate config files while maintaining consistency.

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Read the [docs](https://docs.ultracite.ai/) for detailed setup instructions, configuration options, and examples.