Source: https://seerepo.com/compare/Mail-0/Zero/vs/shadcn-ui/ui
Markdown source: https://seerepo.com/compare/Mail-0/Zero/vs/shadcn-ui/ui.md
Description: Zero and ui share 22 technologies: React, React Router, Vite, MCP, Tailwind CSS, class-variance-authority, next-themes, sonner, Radix UI, motion, React Hook Form, dnd-kit, recharts, cmdk, input-otp, react-day-picker, react-resizable-panels, vaul, Lucide, ai, streamdown, and Zod. Both are written in TypeScript.

# Zero vs ui

Zero and ui share 22 technologies: React, React Router, Vite, MCP, Tailwind CSS, class-variance-authority, next-themes, sonner, Radix UI, motion, React Hook Form, dnd-kit, recharts, cmdk, input-otp, react-day-picker, react-resizable-panels, vaul, Lucide, ai, streamdown, and Zod. Both are written in TypeScript.

- [Mail-0/Zero](https://seerepo.com/r/Mail-0/Zero): Experience email the way you want with Mail0 – the first open source email app that puts your privacy and safety first. Join the discord: https://mail0.link/discord
- [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, React Router, Vite, MCP, Tailwind CSS, class-variance-authority, next-themes, sonner, Radix UI, motion, React Hook Form, dnd-kit, recharts, cmdk, input-otp, react-day-picker, react-resizable-panels, vaul, Lucide, ai, streamdown, Zod
- Only in Zero: idb-keyval, PostHog, Sentry, Hono, Redis, Postgres, Gmail, Resend, tRPC, tailwind-merge, tiptap, react-hotkeys-hook, novel, ProseMirror, tiptap-markdown, virtua, canvas-confetti, react-wrap-balancer, Better Auth, agents, ElevenLabs, @react-email/components, dompurify, email-addresses, sanitize-html, @hookform/resolvers, Drizzle, @tsndr/cloudflare-worker-jwt, jose, OpenRouter, he, Cheerio, mimetext, react-email, string-strip-html, postal-mime, zod-to-json-schema, @clack/prompts
- Only in ui: Next.js, fumadocs-core, lru-cache, Vercel, SQLite, TanStack, cn, Base UI, react-aria-components, embla-carousel-react, hugeicons, @tabler/icons-react, @phosphor-icons/react, @remixicon/react, @ai-sdk/react, shiki, react-qr-code, front-matter, unist-util-visit, PostCSS, prompts, ora, postcss-selector-parser

## Side by side

| | Zero | ui |
|---|---|---|
| Size | 91,712 lines written, 441 code files | 636,360 lines written, 3,888 code files |
| Who writes it | 0.6% of its commits signed by AI. With CodeRabbit, Devin, and Claude Code | 2.9% of its commits signed by AI. With Claude Code, Cursor, GitHub Copilot, Codex, and Devin |
| Activity | Last push October 27, 2026, 2,805 commits, 10,886 stars | Last push November 11, 2026, 2,309 commits, 127,941 stars |
| Tests | 62 test files. 16.6% 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, Zero or ui?

ui, with 636,360 lines written; Zero has 91,712.

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

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

ui, with 127,941 stars; Zero has 10,886.

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

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

ui, with 415 test files; Zero has 62.

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

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

ui: its last push was on November 11, 2026, and Zero's on October 27, 2026.

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

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

ui: an AI signed 2.9% of its commits, with Claude Code, Cursor, GitHub Copilot, Codex, and Devin; in Zero, 0.6%.

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

## Sources

- Mail-0/Zero: Read on November 13, 2026, at commit 3613273 (https://github.com/Mail-0/Zero/tree/36132735ca3b734b23f48127f9271c80d1ba76e7)
- 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.