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.
Quick Start
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.
Read the docs for detailed setup instructions, configuration options, and examples.