Source: https://seerepo.com/compare/cosscom/ui/vs/multica-ai/multica
Markdown source: https://seerepo.com/compare/cosscom/ui/vs/multica-ai/multica.md
Description: ui and multica share 18 technologies: React, Next.js, fumadocs-core, Tailwind CSS, class-variance-authority, next-themes, tailwind-merge, react-day-picker, TanStack, dnd-kit, input-otp, sonner, cmdk, react-resizable-panels, shiki, Zod, Base UI, and motion. ui is written in TypeScript and multica in Go.

# ui vs multica

ui and multica share 18 technologies: React, Next.js, fumadocs-core, Tailwind CSS, class-variance-authority, next-themes, tailwind-merge, react-day-picker, TanStack, dnd-kit, input-otp, sonner, cmdk, react-resizable-panels, shiki, Zod, Base UI, and motion. ui is written in TypeScript and multica in Go.

- [cosscom/ui](https://seerepo.com/r/cosscom/ui): coss.com/ui is the official design system of Cal.com
- [multica-ai/multica](https://seerepo.com/r/multica-ai/multica): Make humans and AI agents work as one team — open-source and self-hostable.

## What they share and what sets them apart

- In common: React, Next.js, fumadocs-core, Tailwind CSS, class-variance-authority, next-themes, tailwind-merge, react-day-picker, TanStack, dnd-kit, input-otp, sonner, cmdk, react-resizable-panels, shiki, Zod, Base UI, motion
- Only in ui: Radix UI, react-aria-components, headless-tree, react-payment-inputs, shadcn, emblor, react-aria, use-mask-input, react-phone-number-input, Lucide, @remixicon/react, hast-util-to-jsx-runtime, @daypicker/react, hugeicons, @shikijs/transformers
- Only in multica: net/http, chi, go-redis, pgx, s3, Postgres, Redis, OpenAI, Resend, react-router-dom, Electron, @electron-toolkit/preload, react-native, Expo, expo-secure-store, PostHog, github.com/golang-jwt/jwt/v5, github.com/aws/aws-sdk-go-v2/credentials, openai-go, github.com/yuin/goldmark, github.com/tdewolff/parse/v2, Prometheus, github.com/aws/aws-sdk-go-v2, github.com/aws/aws-sdk-go-v2/config, github.com/lmittmann/tint, gopkg.in/natefinch/lumberjack.v2, fontsource-variable, nativewind, @shikijs/themes, rn-primitives, react-native-safe-area-context, react-native-svg, expo-image, react-native-reanimated, react-native-gesture-handler, react-native-keyboard-controller, Shopify, @react-native-community/datetimepicker, expo-status-bar, react-native-enriched-markdown, react-native-image-viewing, react-native-shiki-engine, rn-emoji-keyboard, @expo/vector-icons, input-otp-native, expo-image-picker, expo-document-picker, mdast-util-from-markdown, micromark-util-sanitize-uri, @shikijs/core, marked, @tailwindcss/postcss, PostCSS, entities, yaml, @number-flow/react, emoji-mart, recharts, react-markdown, rehype-sanitize, katex, linkify-it, rehype-katex, rehype-raw, remark-breaks, remark-gfm, remark-math, tiptap, react-virtuoso, @floating-ui/dom, lowlight, Mermaid, react-easy-crop, hast-util-to-html, react-qr-code, @tiptap/markdown, mdast-util-gfm-table, mdast-util-math, micromark-extension-gfm-table, micromark-extension-math, remark-cjk-friendly, unist-util-visit

## Side by side

| | ui | multica |
|---|---|---|
| Size | 160,398 lines written, 1,547 code files | 1,527,292 lines written, 2,983 code files |
| Who writes it | 6.2% of its commits signed by AI. With Devin, Cursor, and Claude Code | 36.5% of its commits signed by AI. With Claude Code, Cursor, Codex, and GitHub Copilot |
| Activity | Last push November 9, 2026, 1,057 commits, 10,841 stars | Last push November 13, 2026, 5,698 commits, 55,931 stars |
| Tests | 9 test files. 0.6% of its code files have a test that imports them | 2,710 test files. 63.8% 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, ui or multica?

multica, with 1,527,292 lines written; ui has 160,398.

The proof: [multica-ai/multica's code at commit aaa069a](https://github.com/multica-ai/multica/tree/aaa069a9efdf56de1eb01d1a707c9e2c7b7fe4b5)

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

multica, with 55,931 stars; ui has 10,841.

The proof: [multica-ai/multica on GitHub](https://github.com/multica-ai/multica)

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

multica, with 2,710 test files; ui has 9.

The proof: [multica-ai/multica's code at commit aaa069a](https://github.com/multica-ai/multica/tree/aaa069a9efdf56de1eb01d1a707c9e2c7b7fe4b5)

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

multica: its last push was on November 13, 2026, and ui's on November 9, 2026.

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

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

multica: an AI signed 36.5% of its commits, with Claude Code, Cursor, Codex, and GitHub Copilot; in ui, 6.2%.

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

## Sources

- cosscom/ui: Read on November 13, 2026, at commit fe6ffa8 (https://github.com/cosscom/ui/tree/fe6ffa81f434a4afe1c01564c13bb237564c42e2)
- multica-ai/multica: Read on November 13, 2026, at commit aaa069a (https://github.com/multica-ai/multica/tree/aaa069a9efdf56de1eb01d1a707c9e2c7b7fe4b5)

## 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.