Source: https://seerepo.com/compare/pastelsky/bundlephobia/vs/shadcn-ui/ui
Markdown source: https://seerepo.com/compare/pastelsky/bundlephobia/vs/shadcn-ui/ui.md
Description: bundlephobia and ui share 9 technologies: React, Next.js, lru-cache, MCP, Vite, Base UI, Zod, Tailwind CSS, and Lucide. Both are written in TypeScript.

# bundlephobia vs ui

bundlephobia and ui share 9 technologies: React, Next.js, lru-cache, MCP, Vite, Base UI, Zod, Tailwind CSS, and Lucide. Both are written in TypeScript.

- [pastelsky/bundlephobia](https://seerepo.com/r/pastelsky/bundlephobia): 🏋️ Find out the cost of adding a new frontend dependency to your project
- [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.

## What they share and what sets them apart

- In common: React, Next.js, lru-cache, MCP, Vite, Base UI, Zod, Tailwind CSS, Lucide
- Only in bundlephobia: Fastify, Koa, Firebase, GitHub, react-router-dom, classnames, Anime.js, Contentful, d3-path, d3-scale, downshift, fabric, react-dropzone, natural, dompurify, remark, strip-markdown, prom-client, winston, validate-npm-package-name, @tremor/react
- Only in ui: fumadocs-core, Vercel, SQLite, React Router, TanStack, cn, class-variance-authority, next-themes, recharts, Radix UI, react-aria-components, sonner, react-resizable-panels, embla-carousel-react, input-otp, react-day-picker, cmdk, dnd-kit, motion, vaul, React Hook Form, hugeicons, @tabler/icons-react, @phosphor-icons/react, @remixicon/react, ai, @ai-sdk/react, shiki, react-qr-code, streamdown, front-matter, unist-util-visit, PostCSS, prompts, ora, postcss-selector-parser

## Side by side

| | bundlephobia | ui |
|---|---|---|
| Size | 50,445 lines written, 253 code files | 636,360 lines written, 3,888 code files |
| Who writes it | 27.6% of its commits signed by AI. With Codex and Claude Code | 2.9% of its commits signed by AI. With Claude Code, Cursor, GitHub Copilot, Codex, and Devin |
| Activity | Last push November 14, 2026, 855 commits, 9,623 stars | Last push November 11, 2026, 2,309 commits, 127,941 stars |
| Tests | 69 test files. 32% of its code files have a test that imports them | 415 test files. 3.8% 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, bundlephobia or ui?

ui, with 636,360 lines written; bundlephobia has 50,445.

The proof: [shadcn-ui/ui's code at commit dd41d19](https://github.com/shadcn-ui/ui/tree/dd41d19e2f80ff6891951f7ced74c2c9a650b065)

### Which has more GitHub stars, bundlephobia or ui?

ui, with 127,941 stars; bundlephobia has 9,623.

The proof: [shadcn-ui/ui on GitHub](https://github.com/shadcn-ui/ui)

### Which has more tests, bundlephobia or ui?

ui, with 415 test files; bundlephobia has 69.

The proof: [shadcn-ui/ui's code at commit dd41d19](https://github.com/shadcn-ui/ui/tree/dd41d19e2f80ff6891951f7ced74c2c9a650b065)

### Which was updated more recently, bundlephobia or ui?

bundlephobia: its last push was on November 14, 2026, and ui's on November 11, 2026.

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

### Which has more commits signed by AI, bundlephobia or ui?

bundlephobia: an AI signed 27.6% of its commits, with Codex and Claude Code; in ui, 2.9%.

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

## Sources

- pastelsky/bundlephobia: Read on November 14, 2026, at commit 2a7d5b6 (https://github.com/pastelsky/bundlephobia/tree/2a7d5b6d69e8036509c5a507a1ee39f147230233)
- shadcn-ui/ui: Read on November 12, 2026, at commit dd41d19 (https://github.com/shadcn-ui/ui/tree/dd41d19e2f80ff6891951f7ced74c2c9a650b065)

## 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.