Source: https://seerepo.com/compare/swc-project/swc/vs/vercel/next.js
Markdown source: https://seerepo.com/compare/swc-project/swc/vs/vercel/next.js.md
Description: swc and next.js share 5 technologies: React, Tokio, prop-types, tracing, and tracing-subscriber. swc is written in Rust and next.js in JavaScript.

# swc vs next.js

swc and next.js share 5 technologies: React, Tokio, prop-types, tracing, and tracing-subscriber. swc is written in Rust and next.js in JavaScript.

- [swc-project/swc](https://seerepo.com/r/swc-project/swc): Rust-based platform for the Web
- [vercel/next.js](https://seerepo.com/r/vercel/next.js): The React Framework

## What they share and what sets them apart

- In common: React, Tokio, prop-types, tracing, tracing-subscriber
- Only in swc: lru, wasmtime, lightningcss, antd, dialoguer, yaml, jsonc-parser
- Only in next.js: Express, concurrent-queue, scheduler, Next.js, react-server-dom-webpack, styled-jsx, emotion, Tailwind CSS, PostCSS, geist, MUI, react-virtualized, Framer, Headless UI, @heroicons/react, Lucide, Cheerio, js-yaml, image, sharp, Ajv, OpenTelemetry, pino, class-variance-authority, next-themes, tailwind-merge, Radix UI, cmdk, prompts, Sass

## Side by side

| | swc | next.js |
|---|---|---|
| Size | 3,928,024 lines written, 1,214 code files | 2,391,614 lines written, 5,697 code files |
| Who writes it | 1% of its commits signed by AI. With Claude Code, GitHub Copilot, and Warp | 0.8% of its commits signed by AI. With Claude Code, Cursor, GitHub Copilot, and Devin |
| Activity | Last push November 6, 2026, 12,405 commits, 34,208 stars | Last push November 4, 2026, 36,392 commits, 143,262 stars |
| Tests | 48,541 test files. 14.3% of its code files have a test that imports them | 18,587 test files. 6.5% of its code files have a test that imports them |

- Size: Lines written by people and agents, without generated ones; code files, without tests.
- Who writes it: A commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
- Activity: From GitHub and its history, on the day SeeRepo read it.
- Tests: The files that test the code, and the share of code files a test imports.

## Frequently asked questions

### Which is bigger, swc or next.js?

swc, with 3,928,024 lines written; next.js has 2,391,614.

The proof: [swc-project/swc's code at commit dc9d310](https://github.com/swc-project/swc/tree/dc9d310e3c8bb63312a9a5ec6803d585034ecb14)

### Which has more GitHub stars, swc or next.js?

next.js, with 143,262 stars; swc has 34,208.

The proof: [vercel/next.js on GitHub](https://github.com/vercel/next.js)

### Which has more tests, swc or next.js?

swc, with 48,541 test files; next.js has 18,587.

The proof: [swc-project/swc's code at commit dc9d310](https://github.com/swc-project/swc/tree/dc9d310e3c8bb63312a9a5ec6803d585034ecb14)

### Which was updated more recently, swc or next.js?

swc: its last push was on November 6, 2026, and next.js's on November 4, 2026.

The proof: [swc-project/swc's commits on GitHub](https://github.com/swc-project/swc/commits)

### Which has more commits signed by AI, swc or next.js?

swc: an AI signed 1% of its commits, with Claude Code, GitHub Copilot, and Warp; in next.js, 0.8%.

The proof: [the commits each tool signed in swc-project/swc](https://seerepo.com/r/swc-project/swc/ai)

## Sources

- swc-project/swc: Read on November 7, 2026, at commit dc9d310 (https://github.com/swc-project/swc/tree/dc9d310e3c8bb63312a9a5ec6803d585034ecb14)
- vercel/next.js: Read on November 4, 2026, at commit 97f1a2c (https://github.com/vercel/next.js/tree/97f1a2c8a1deb23cf03855d67f942c0fe3ded1ce)

## What is your repo built with?

Any public repo, with no account: https://seerepo.com/r/owner/repo/built, with the owner and name it has on GitHub.