Source: https://seerepo.com/compare/calcom/cal.diy/vs/hydralauncher/hydra
Markdown source: https://seerepo.com/compare/calcom/cal.diy/vs/hydralauncher/hydra.md
Description: cal.diy and hydra share 11 technologies: Sentry, React, classnames, React Hook Form, TanStack, Framer, Radix UI, Lucide, markdown-it, @hookform/resolvers, and sharp. Both are written in TypeScript.

# cal.diy vs hydra

cal.diy and hydra share 11 technologies: Sentry, React, classnames, React Hook Form, TanStack, Framer, Radix UI, Lucide, markdown-it, @hookform/resolvers, and sharp. Both are written in TypeScript.

- [calcom/cal.diy](https://seerepo.com/r/calcom/cal.diy): Scheduling infrastructure for absolutely everyone.
- [hydralauncher/hydra](https://seerepo.com/r/hydralauncher/hydra): Hydra Launcher is an open-source gaming platform created to be the single tool that you need

## What they share and what sets them apart

- In common: Sentry, React, classnames, React Hook Form, TanStack, Framer, Radix UI, Lucide, markdown-it, @hookform/resolvers, sharp
- Only in cal.diy: connect, Next.js, @nestjs/core, Postgres, @nestjs/bull, @nest-lab/throttler-storage-redis, bull, Redis, Google, Stripe, NestJS, @next/third-parties, Vercel, PostHog, @trpc/server, tRPC, lru-cache, kysely, next-auth, helmet, class-validator, class-transformer, Zod, nest-winston, tslog, winston, winston-transport, Tailwind CSS, next-themes, class-variance-authority, sonner, @formkit/auto-animate, react-select, react-inlinesvg, react-sticky-box, bcryptjs, jose, otplib, node-html-parser, qrcode, react-qr-code, ink, ink-text-input, ink-select-input, ical.js, tailwind-merge, Base UI, entities, nodemailer, handlebars, dompurify, jimp, remove-markdown, sanitize-html, turndown, marked, Prisma, node-ical, lexical, react-easy-crop, cmdk, react-colorful, react-day-picker, @lexical/markdown
- Only in hydra: Vite, react-router-dom, Electron, Tokio, @fontsource/noto-sans, sass-embedded, react-tooltip, react-loading-skeleton, tiptap, embla-carousel-react, react-infinite-scroll-component, x11rb, @floating-ui/dom, rc-virtual-list, react-shadow, @atlaskit/pragmatic-drag-and-drop, @monaco-editor/react, canvas-confetti, recharts, @primer/octicons-react, @phosphor-icons/react, country-flag-icons, jsonwebtoken, file-type, yaml, image, thumbhash, yup, electron-log

## Side by side

| | cal.diy | hydra |
|---|---|---|
| Size | 554,567 lines written, 4,308 code files | 444,027 lines written, 2,107 code files |
| Who writes it | 6.3% of its commits signed by AI. With Devin, Claude Code, CodeRabbit, Cursor, and GitHub Copilot | 9.6% of its commits signed by AI. With Claude Code, Codex, Cursor, and GitHub Copilot |
| Activity | Last push November 3, 2026, 16,069 commits, 49,716 stars | Last push November 6, 2026, 6,007 commits, 17,640 stars |
| Tests | 644 test files. 14.8% of its code files have a test that imports them | 341 test files. 17.2% 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 hydra?

cal.diy, with 554,567 lines written; hydra has 444,027.

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 hydra?

cal.diy, with 49,716 stars; hydra has 17,640.

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

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

cal.diy, with 644 test files; hydra has 341.

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 hydra?

hydra: its last push was on November 6, 2026, and cal.diy's on November 3, 2026.

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

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

hydra: an AI signed 9.6% of its commits, with Claude Code, Codex, Cursor, and GitHub Copilot; in cal.diy, 6.3%.

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

## Sources

- calcom/cal.diy: Read on November 5, 2026, at commit 2eb48ec (https://github.com/calcom/cal.diy/tree/2eb48eccd8aca8a0c0ffabf28cf92e298b33ecee)
- hydralauncher/hydra: Read on November 6, 2026, at commit 2bb1787 (https://github.com/hydralauncher/hydra/tree/2bb1787c9ba00ca0e3190976af1cb8cca5327e7c)

## 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.