Source: https://seerepo.com/compare/shadcn-ui/ui/vs/vercel/next.js
Markdown source: https://seerepo.com/compare/shadcn-ui/ui/vs/vercel/next.js.md
Description: ui and next.js share 11 technologies: React, Next.js, Tailwind CSS, class-variance-authority, next-themes, Radix UI, cmdk, Lucide, PostCSS, geist, and prompts. ui is written in TypeScript and next.js in JavaScript.

# ui vs next.js

ui and next.js share 11 technologies: React, Next.js, Tailwind CSS, class-variance-authority, next-themes, Radix UI, cmdk, Lucide, PostCSS, geist, and prompts. ui is written in TypeScript and next.js in JavaScript.

- [shadcn-ui/ui](https://seerepo.com/r/shadcn-ui/ui): Composable, accessible components with thoughtful defaults. Build your own component library with code you can customize, extend, and make your own.
- [vercel/next.js](https://seerepo.com/r/vercel/next.js): The React Framework

## What they share and what sets them apart

- In common: React, Next.js, Tailwind CSS, class-variance-authority, next-themes, Radix UI, cmdk, Lucide, PostCSS, geist, prompts
- Only in ui: lru-cache, Vercel, MCP, React Router, Vite, TanStack, cn, recharts, Base UI, sonner, react-resizable-panels, embla-carousel-react, react-day-picker, dnd-kit, motion, vaul, React Hook Form, hugeicons, @tabler/icons-react, @phosphor-icons/react, @remixicon/react, ai, @ai-sdk/react, shiki, streamdown, unist-util-visit, Zod, tailwindcss-animate, ora
- Only in next.js: Express, concurrent-queue, Tokio, scheduler, react-server-dom-webpack, styled-jsx, emotion, MUI, react-virtualized, Framer, Headless UI, @heroicons/react, Cheerio, js-yaml, image, sharp, prop-types, Ajv, tracing, tracing-subscriber, OpenTelemetry, pino, tailwind-merge, Sass

## Side by side

| | ui | next.js |
|---|---|---|
| Size | 636,496 lines written, 3,892 code files | 2,391,614 lines written, 5,697 code files |
| Who writes it | 3% of its commits signed by AI. With Claude Code, Cursor, GitHub Copilot, Codex, and Devin | 0.8% of its commits signed by AI. With Claude Code, Cursor, GitHub Copilot, and Devin |
| Activity | Last push November 4, 2026, 2,298 commits, 127,326 stars | Last push November 4, 2026, 36,392 commits, 143,262 stars |
| Tests | 415 test files. 3.8% 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, ui or next.js?

next.js, with 2,391,614 lines written; ui has 636,496.

The proof: [vercel/next.js's code at commit 97f1a2c](https://github.com/vercel/next.js/tree/97f1a2c8a1deb23cf03855d67f942c0fe3ded1ce)

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

next.js, with 143,262 stars; ui has 127,326.

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

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

next.js, with 18,587 test files; ui has 415.

The proof: [vercel/next.js's code at commit 97f1a2c](https://github.com/vercel/next.js/tree/97f1a2c8a1deb23cf03855d67f942c0fe3ded1ce)

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

Both got their last push on November 4, 2026.

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

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

ui: an AI signed 3% of its commits, with Claude Code, Cursor, GitHub Copilot, Codex, and Devin; in next.js, 0.8%.

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

## Sources

- shadcn-ui/ui: Read on November 4, 2026, at commit 8a35366 (https://github.com/shadcn-ui/ui/tree/8a3536678a528cc012b9e62484290e79d0be410f)
- 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.