Source: https://seerepo.com/compare/shadcn-ui/ui/vs/vercel-labs/json-render
Markdown source: https://seerepo.com/compare/shadcn-ui/ui/vs/vercel-labs/json-render.md
Description: ui and json-render share 19 technologies: React, Next.js, MCP, TanStack, Tailwind CSS, class-variance-authority, next-themes, Radix UI, sonner, react-resizable-panels, embla-carousel-react, vaul, Lucide, ai, @ai-sdk/react, shiki, streamdown, Zod, and geist. Both are written in TypeScript.

# ui vs json-render

ui and json-render share 19 technologies: React, Next.js, MCP, TanStack, Tailwind CSS, class-variance-authority, next-themes, Radix UI, sonner, react-resizable-panels, embla-carousel-react, vaul, Lucide, ai, @ai-sdk/react, shiki, streamdown, Zod, and geist. Both are written in TypeScript.

- [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-labs/json-render](https://seerepo.com/r/vercel-labs/json-render): The Generative UI framework

## What they share and what sets them apart

- In common: React, Next.js, MCP, TanStack, Tailwind CSS, class-variance-authority, next-themes, Radix UI, sonner, react-resizable-panels, embla-carousel-react, vaul, Lucide, ai, @ai-sdk/react, shiki, streamdown, Zod, geist
- Only in ui: lru-cache, Vercel, React Router, Vite, cn, recharts, Base UI, react-day-picker, cmdk, dnd-kit, motion, React Hook Form, hugeicons, @tabler/icons-react, @phosphor-icons/react, @remixicon/react, unist-util-visit, tailwindcss-animate, PostCSS, prompts, ora
- Only in json-render: Redis, fumadocs-core, Solid, Svelte, Vue, react-native, remotion, tailwind-merge, bash-tool, yaml, chat, @resvg/resvg-js, satori, ink, marked, react-email, @react-pdf/renderer, react-three, three, tailwind-variants, bits-ui

## Side by side

| | ui | json-render |
|---|---|---|
| Size | 636,496 lines written, 3,892 code files | 167,309 lines written, 1,048 code files |
| Who writes it | 3% of its commits signed by AI. With Claude Code, Cursor, GitHub Copilot, Codex, and Devin | 1.6% of its commits signed by AI. With Claude Code |
| Activity | Last push November 4, 2026, 2,298 commits, 127,326 stars | Last push November 6, 2026, 250 commits, 18,930 stars |
| Tests | 415 test files. 3.8% of its code files have a test that imports them | 99 test files. 11% 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 json-render?

ui, with 636,496 lines written; json-render has 167,309.

The proof: [shadcn-ui/ui's code at commit 8a35366](https://github.com/shadcn-ui/ui/tree/8a3536678a528cc012b9e62484290e79d0be410f)

### Which has more GitHub stars, ui or json-render?

ui, with 127,326 stars; json-render has 18,930.

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

### Which has more tests, ui or json-render?

ui, with 415 test files; json-render has 99.

The proof: [shadcn-ui/ui's code at commit 8a35366](https://github.com/shadcn-ui/ui/tree/8a3536678a528cc012b9e62484290e79d0be410f)

### Which was updated more recently, ui or json-render?

json-render: its last push was on November 6, 2026, and ui's on November 4, 2026.

The proof: [vercel-labs/json-render's commits on GitHub](https://github.com/vercel-labs/json-render/commits)

### Which has more commits signed by AI, ui or json-render?

ui: an AI signed 3% of its commits, with Claude Code, Cursor, GitHub Copilot, Codex, and Devin; in json-render, 1.6%.

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-labs/json-render: Read on November 6, 2026, at commit 1819412 (https://github.com/vercel-labs/json-render/tree/18194121c8f087afacd9a8ef65fbda18374ee039)

## 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.