Source: https://seerepo.com/compare/cosscom/ui/vs/novuhq/novu
Markdown source: https://seerepo.com/compare/cosscom/ui/vs/novuhq/novu.md
Description: ui and novu share 16 technologies: React, Next.js, Tailwind CSS, class-variance-authority, next-themes, tailwind-merge, Radix UI, react-day-picker, sonner, cmdk, react-phone-number-input, react-resizable-panels, Lucide, Zod, Base UI, and motion. Both are written in TypeScript.

# ui vs novu

ui and novu share 16 technologies: React, Next.js, Tailwind CSS, class-variance-authority, next-themes, tailwind-merge, Radix UI, react-day-picker, sonner, cmdk, react-phone-number-input, react-resizable-panels, Lucide, Zod, Base UI, and motion. Both are written in TypeScript.

- [cosscom/ui](https://seerepo.com/r/cosscom/ui): coss.com/ui is the official design system of Cal.com
- [novuhq/novu](https://seerepo.com/r/novuhq/novu): The open-source communication infrastructure for agents and products

## What they share and what sets them apart

- In common: React, Next.js, Tailwind CSS, class-variance-authority, next-themes, tailwind-merge, Radix UI, react-day-picker, sonner, cmdk, react-phone-number-input, react-resizable-panels, Lucide, Zod, Base UI, motion
- Only in ui: fumadocs-core, react-aria-components, headless-tree, TanStack, react-payment-inputs, shadcn, dnd-kit, input-otp, emblor, react-aria, use-mask-input, @remixicon/react, hast-util-to-jsx-runtime, shiki, @daypicker/react, hugeicons, @shikijs/transformers
- Only in novu: MCP, NestJS, lru-cache, Redis, Sentry, Vite, react-router-dom, Express, Sanity, Mixpanel, Svix, Clerk, @aws-sdk/s3-request-presigner, Hono, clickhouse-schema, aws-sdk, ClickHouse, @azure/storage-blob, bullmq, Google Cloud, MongoDB, sqs-consumer, sqs-producer, Anthropic, SvelteKit, H3, Solid, Novu, bcrypt, passport-jwt, jsonwebtoken, helmet, Passport, passport-github2, passport-headerapikey, passport-oauth2, chat, liquidjs, entities, class-validator, class-transformer, Ajv, envalid, @nestjs/terminus, New Relic, @uiw/codemirror-themes, tailwind-variants, React Hook Form, uiw, react-querybuilder, tiptap, CodeMirror, recharts, xyflow, react-confetti, @lezer/highlight, react-helmet-async, @streamdown/code, Cal.com, @assistant-ui/react-markdown, @number-flow/react, @rjsf/core, json-edit-react, prism-react-renderer, react-colorful, react-timezone-select, use-stick-to-bottom, react-icons, @radix-ui/react-icons, Better Auth, @assistant-ui/react, ai, @ai-sdk/react, react-qr-code, streamdown, remark-gfm, sanitize-html, @hookform/resolvers, json-schema, rjsf, ajv-formats, sharp, mailparser, html-to-text, spamc, pino, agents, inline-css, @socket.io/admin-ui, @nestjs/jwt, @tsndr/cloudflare-worker-jwt, handlebars, zod-to-json-schema, nestjs-pino, nestjs-otel, @aws-sdk/client-scheduler, opentelemetry, tippy.js, lowlight, highlight.js, @tiptap/core, juice, node-html-parser, react-email, @react-email/components, prompts, LangChain, qrcode, hast-util-to-html, mdast-util-to-hast, Vercel, aws-lambda, PostCSS, @floating-ui/dom, solid-floating-ui, solid-motionone, @kobalte/core, ink, @inkjs/ui, ora, ink-scroll-view, jwt-decode, marked, validate-npm-package-name, Vonage, nodemailer, @aws-sdk/client-sesv2, anypost, emailjs, mailersend, node-mailjet, postmark, sendgrid, sns-validator

## Side by side

| | ui | novu |
|---|---|---|
| Size | 160,398 lines written, 1,547 code files | 1,243,881 lines written, 8,316 code files |
| Who writes it | 6.2% of its commits signed by AI. With Devin, Cursor, and Claude Code | 8.5% of its commits signed by AI. With Cursor, Claude Code, Devin, GitHub Copilot, and CodeRabbit |
| Activity | Last push November 9, 2026, 1,057 commits, 10,841 stars | Last push November 13, 2026, 16,810 commits, 40,337 stars |
| Tests | 9 test files. 0.6% of its code files have a test that imports them | 1,319 test files. 16.6% 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 novu?

novu, with 1,243,881 lines written; ui has 160,398.

The proof: [novuhq/novu's code at commit cb58333](https://github.com/novuhq/novu/tree/cb5833340c188f318db7c2c604327ce9bf9a5e3c)

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

novu, with 40,337 stars; ui has 10,841.

The proof: [novuhq/novu on GitHub](https://github.com/novuhq/novu)

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

novu, with 1,319 test files; ui has 9.

The proof: [novuhq/novu's code at commit cb58333](https://github.com/novuhq/novu/tree/cb5833340c188f318db7c2c604327ce9bf9a5e3c)

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

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

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

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

novu: an AI signed 8.5% of its commits, with Cursor, Claude Code, Devin, GitHub Copilot, and CodeRabbit; in ui, 6.2%.

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

## Sources

- cosscom/ui: Read on November 13, 2026, at commit fe6ffa8 (https://github.com/cosscom/ui/tree/fe6ffa81f434a4afe1c01564c13bb237564c42e2)
- novuhq/novu: Read on November 13, 2026, at commit cb58333 (https://github.com/novuhq/novu/tree/cb5833340c188f318db7c2c604327ce9bf9a5e3c)

## 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.