Runtime Accelerated Rendering Infrastructure
rari is a React Server Components framework running on a Rust runtime. It has three layers: a Rust runtime (HTTP server, RSC renderer, and router with embedded V8), a React framework (app router, server actions, streaming/Suspense), and a build toolchain (Rolldown-powered Vite bundling, tsgo type checking). You write standard React, the runtime underneath is Rust instead of Node.
- App Router - File-based routing with layouts, loading states, and error boundaries
- Server-Side Rendering - Pre-rendered HTML with instant hydration
- React Server Components - Server components by default, client components when you need them
- Rust-powered runtime - HTTP server, RSC renderer, and routing written in Rust with embedded V8
- Zero-config setup - Works out of the box with pre-built binaries
- Hot module reloading - Instant feedback during development
- node_modules support - Standard npm package resolution without
npm:specifier - TypeScript-first - Full type safety across server/client boundary
- Cross-platform - Supports macOS, Linux, and Windows
- Streaming SSR - Progressive rendering with Suspense boundaries
- Loading States - Automatic loading skeletons during navigation
Create a new rari application in seconds:
npm create rari-app@latest my-app
cd my-app
npm run devThat's it! Your app will be running at http://localhost:5173.
Visit rari.build/docs for complete documentation, guides, and examples.
Read the full documentation to learn more about:
- Getting started with rari
- App Router and file-based routing
- Server Components and Client Components
- Server Actions and data mutations
- Streaming SSR and Suspense
- Deployment and production optimization
rari delivers exceptional performance that significantly outperforms traditional React frameworks:
Benchmarks last updated: May 25, 2026 (rari v0.13.11)
Response Time (Single Request):
| Metric | rari | Next.js | Improvement |
|---|---|---|---|
| Average | 0.12ms | 2.17ms | 18.1x faster |
| P95 | 0.16ms | 2.37ms | 14.8x faster |
| Bundle Size | 285 KB | 634 KB | 55% smaller |
Throughput Under Load (50 concurrent connections, 30s):
| Metric | rari | Next.js | Improvement |
|---|---|---|---|
| Requests/sec | 97,826 | 1,452 | 67.4x higher |
| Avg Latency | 0.51ms | 34.46ms | 67.6x faster |
| P95 Latency | 0.82ms | 43.41ms | 52.9x faster |
| Errors | 0 | 0 | Stable |
Build Performance:
| Metric | rari | Next.js | Improvement |
|---|---|---|---|
| Build Time | 1.75s | 4.42s | 2.5x faster |
| Bundle Size | 285 KB | 634 KB | 55% smaller |
All benchmarks are reproducible. See benchmarks/ for methodology and tools.
We welcome contributions! Here's how you can help:
- Report Bugs - Found an issue? Open a bug report
- Suggest Features - Have ideas? Share your suggestions
- Improve Docs - Help make our documentation better
- Submit PRs - Check out our Contributing Guide
- Discord - Join our community
- GitHub - Star the repo
- Documentation - rari.build/docs
rari is made possible by the support of these companies:
Neon - Serverless Postgres. Autoscaling, branching, and scale to zero.
Interested in sponsoring rari? Get in touch or support us on GitHub Sponsors.
MIT License - see LICENSE for details.