Source: https://seerepo.com/compare/meta/stylex/vs/vercel/next.js
Markdown source: https://seerepo.com/compare/meta/stylex/vs/vercel/next.js.md
Description: stylex and next.js share 3 technologies: React, PostCSS, and lightningcss. Both are written in JavaScript.

# stylex vs next.js

stylex and next.js share 3 technologies: React, PostCSS, and lightningcss. Both are written in JavaScript.

- [meta/stylex](https://seerepo.com/r/meta/stylex): StyleX is the styling system for ambitious user interfaces.
- [vercel/next.js](https://seerepo.com/r/vercel/next.js): The React Framework

## What they share and what sets them apart

- In common: React, PostCSS, lightningcss
- Only in stylex: postcss-value-parser, @clack/prompts, @csstools/css-tokenizer, styleq
- Only in next.js: Express, turbo-persistence, concurrent-queue, quick_cache, next-api, next-core, Tokio, react-relay, scheduler, Next.js, Datadog, styled-components, styled-jsx, emotion, Tailwind CSS, @picocss/pico, allsorts, cssparser, geist, parcel_selectors, plotters, tabled, @heroicons/react, Lucide, turbopack-mdx, mdxjs, jsonc-parser, image, imagesize, markdown, tracing, tracing-subscriber, console-subscriber, tracing-chrome, class-variance-authority, next-themes, polished, tailwind-merge, Radix UI, cmdk, react-virtuoso, prompts, validate-npm-package-name, fontkit, Cheerio, @capsizecss/metrics, critters, cssnano-preset-default, @base-ui-components/react, sharp, Sass

## Side by side

| | stylex | next.js |
|---|---|---|
| Size | 187,007 lines written, 444 code files | 2,424,111 lines written, 3,317 code files |
| Who writes it | 2.9% of its commits signed by AI. With Claude Code, Cursor, and GitHub Copilot | 0.8% of its commits signed by AI. With Claude Code, Cursor, GitHub Copilot, and Devin |
| Activity | Last push November 12, 2026, 1,031 commits, 10,490 stars | Last push November 12, 2026, 36,533 commits, 143,476 stars |
| Tests | 162 test files. 20.3% of its code files have a test that imports them | 19,092 test files. 11.3% 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, stylex or next.js?

next.js, with 2,424,111 lines written; stylex has 187,007.

The proof: [vercel/next.js's code at commit 3642b24](https://github.com/vercel/next.js/tree/3642b242d40fb98652ee0894c2df8bfc510cc9aa)

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

next.js, with 143,476 stars; stylex has 10,490.

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

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

next.js, with 19,092 test files; stylex has 162.

The proof: [vercel/next.js's code at commit 3642b24](https://github.com/vercel/next.js/tree/3642b242d40fb98652ee0894c2df8bfc510cc9aa)

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

Both got their last push on November 12, 2026.

The proof: [meta/stylex's commits on GitHub](https://github.com/meta/stylex/commits)

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

stylex: an AI signed 2.9% of its commits, with Claude Code, Cursor, and GitHub Copilot; in next.js, 0.8%.

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

## Sources

- meta/stylex: Read on November 13, 2026, at commit c5f04fc (https://github.com/meta/stylex/tree/c5f04fc49132c97ae6f65a905f84470e4fc05c31)
- vercel/next.js: Read on November 12, 2026, at commit 3642b24 (https://github.com/vercel/next.js/tree/3642b242d40fb98652ee0894c2df8bfc510cc9aa)

## 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.