Source: https://seerepo.com/compare/calcom/cal.diy/vs/rybbit-io/rybbit
Markdown source: https://seerepo.com/compare/calcom/cal.diy/vs/rybbit-io/rybbit.md
Description: cal.diy and rybbit share 18 technologies: Next.js, Postgres, Redis, Stripe, React, kysely, Zod, Tailwind CSS, next-themes, class-variance-authority, React Hook Form, Framer, Radix UI, Lucide, @hookform/resolvers, tailwind-merge, cmdk, and react-day-picker. Both are written in TypeScript.

# cal.diy vs rybbit

cal.diy and rybbit share 18 technologies: Next.js, Postgres, Redis, Stripe, React, kysely, Zod, Tailwind CSS, next-themes, class-variance-authority, React Hook Form, Framer, Radix UI, Lucide, @hookform/resolvers, tailwind-merge, cmdk, and react-day-picker. Both are written in TypeScript.

- [calcom/cal.diy](https://seerepo.com/r/calcom/cal.diy): Scheduling infrastructure for absolutely everyone.
- [rybbit-io/rybbit](https://seerepo.com/r/rybbit-io/rybbit): 🐸 Rybbit - open-source and privacy-friendly alternative to Google Analytics that is 10x more intuitive.

## What they share and what sets them apart

- In common: Next.js, Postgres, Redis, Stripe, React, kysely, Zod, Tailwind CSS, next-themes, class-variance-authority, React Hook Form, Framer, Radix UI, Lucide, @hookform/resolvers, tailwind-merge, cmdk, react-day-picker
- Only in cal.diy: connect, NestJS, @nestjs/bull, @nest-lab/throttler-storage-redis, bull, Google, Sentry, @next/third-parties, Vercel, PostHog, @trpc/server, @jetstreamapp/soql-parser-js, tRPC, lru-cache, next-auth, helmet, class-validator, class-transformer, @axiomhq/winston, nest-winston, tslog, winston, winston-transport, classnames, TanStack, sonner, @formkit/auto-animate, react-select, @hookform/error-message, react-digit-input, react-inlinesvg, @dub/embed-react, Glide, kbar, react-phone-input-2, react-sticky-box, react-timezone-select, react-turnstile, bcryptjs, jose, otplib, mailhog, markdown-it, node-html-parser, qrcode, react-qr-code, @todesktop/client-core, ink, ink-text-input, ink-select-input, @googleapis/oauth2, ical.js, Base UI, entities, nodemailer, handlebars, @trigger.dev/sdk, @sendgrid/client, dompurify, jimp, remove-markdown, sanitize-html, sharp, turndown, marked, Prisma, node-ical, lexical, react-easy-crop, react-colorful, @lexical/markdown
- Only in rybbit: react-native, Fastify, @electric-sql/pglite, sqlstring, ClickHouse, node-cache, MCP, Resend, @fastify/static, @uidotdev/usehooks, tanstack, @number-flow/react, nivo, Mapbox, ol, D3, react-syntax-highlighter, d3-scale, rrweb-player, vaul, @monaco-editor/react, Cal.com, embla-carousel-react, react-grid-layout, react-hot-toast, react-resizable, @icons-pack/react-simple-icons, country-flag-icons, Better Auth, @marsidev/react-turnstile, papaparse, Drizzle, @react-email/components, pino

## Side by side

| | cal.diy | rybbit |
|---|---|---|
| Size | 554,567 lines written, 4,285 code files | 297,531 lines written, 1,245 code files |
| Who writes it | 6.3% of its commits signed by AI. With Devin, Claude Code, CodeRabbit, Cursor, and GitHub Copilot | 5.6% of its commits signed by AI. With Claude Code, GitHub Copilot, CodeRabbit, and Cursor |
| Activity | Last push November 3, 2026, 16,069 commits, 49,876 stars | Last push November 4, 2026, 2,699 commits, 13,256 stars |
| Tests | 644 test files. 14.8% of its code files have a test that imports them | 327 test files. 32.9% 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, cal.diy or rybbit?

cal.diy, with 554,567 lines written; rybbit has 297,531.

The proof: [calcom/cal.diy's code at commit 2eb48ec](https://github.com/calcom/cal.diy/tree/2eb48eccd8aca8a0c0ffabf28cf92e298b33ecee)

### Which has more GitHub stars, cal.diy or rybbit?

cal.diy, with 49,876 stars; rybbit has 13,256.

The proof: [calcom/cal.diy on GitHub](https://github.com/calcom/cal.diy)

### Which has more tests, cal.diy or rybbit?

cal.diy, with 644 test files; rybbit has 327.

The proof: [calcom/cal.diy's code at commit 2eb48ec](https://github.com/calcom/cal.diy/tree/2eb48eccd8aca8a0c0ffabf28cf92e298b33ecee)

### Which was updated more recently, cal.diy or rybbit?

rybbit: its last push was on November 4, 2026, and cal.diy's on November 3, 2026.

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

### Which has more commits signed by AI, cal.diy or rybbit?

cal.diy: an AI signed 6.3% of its commits, with Devin, Claude Code, CodeRabbit, Cursor, and GitHub Copilot; in rybbit, 5.6%.

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

## Sources

- calcom/cal.diy: Read on November 10, 2026, at commit 2eb48ec (https://github.com/calcom/cal.diy/tree/2eb48eccd8aca8a0c0ffabf28cf92e298b33ecee)
- rybbit-io/rybbit: Read on November 10, 2026, at commit 4288204 (https://github.com/rybbit-io/rybbit/tree/4288204761ed2fc801fcaa0b3bbfacd1b8cc3936)

## 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.