rari-build/rari

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, TypeScript 7 type checking). You write standard React, the runtime underneath is Rust instead of Node.

Features

• 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

Quick Start

Create a new rari application in seconds:

npm create rari-app@latest my-app
cd my-app
npm run dev

That's it! Your app will be running at http://localhost:5173.

Visit rari.build/docs for complete documentation, guides, and examples.

Documentation

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

Performance

rari delivers exceptional performance that significantly outperforms traditional React frameworks:

Head-to-Head Comparison vs Next.js

Benchmarks last updated: August 10, 2026 (rari v0.15.9)

Response Time (Single Request):

Metric	rari	Next.js	Improvement
Average	0.12ms	1.74ms	14.5x faster
P95	0.12ms	2.44ms	20.3x faster
Bundle Size	287 KB	573 KB	50% smaller

Throughput Under Load (50 concurrent connections, 30s):

Metric	rari	Next.js	Improvement
Requests/sec	89,371	1,683	53.1x higher
Avg Latency	0.56ms	29.73ms	53.1x faster
P95 Latency	0.90ms	36.70ms	40.8x faster
Errors	0	0	Stable

Build Performance:

Metric	rari	Next.js	Improvement
Build Time	1.12s	3.88s	3.5x faster
Bundle Size	287 KB	573 KB	50% smaller

Streaming (/stream, Suspense):

Metric	rari	Next.js	Improvement
TTFB	1ms	12ms	11.1x faster
First content	107ms	108ms	Comparable
Last byte	1007ms	1009ms	Comparable*
Resolved cards	10/10	10/10	Comparable
Throughput	24.99/s	24.99/s	1.0x

*Last-byte time is dominated by intentional ~1000ms card delays, not framework overhead.

All benchmarks are reproducible. See benchmarks/ for methodology and tools.

Contributing

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

Community

• Discord - Join our community
• GitHub - Star the repo
• Documentation - rari.build/docs

Sponsors

rari is made possible by the support of these companies:

Namespace - High-performance cloud infrastructure. CI/CD runners, remote Docker builders, and managed dev environments on bare-metal hardware.

Neon - Serverless Postgres. Autoscaling, branching, and scale to zero.

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Interested in sponsoring rari? Get in touch or support us on GitHub Sponsors.

License

MIT License - see LICENSE for details.