# 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.

## 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 20+ 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.

## Ultracite Cloud

Automated linting and AI-powered fixes for your repositories. Connect your repos and let Ultracite automatically review pull requests, run scheduled lint checks, and fix issues with Claude.

Learn more at [ultracite.ai/cloud](https://www.ultracite.ai/cloud)

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