Source: https://seerepo.com/compare/calcom/cal.diy/vs/liketrek/TREK
Markdown source: https://seerepo.com/compare/calcom/cal.diy/vs/liketrek/TREK.md
Description: cal.diy and TREK share 14 technologies: @nestjs/core, NestJS, React, kysely, helmet, Zod, Tailwind CSS, Lucide, bcryptjs, otplib, qrcode, nodemailer, jimp, and sharp. Both are written in TypeScript.

# cal.diy vs TREK

cal.diy and TREK share 14 technologies: @nestjs/core, NestJS, React, kysely, helmet, Zod, Tailwind CSS, Lucide, bcryptjs, otplib, qrcode, nodemailer, jimp, and sharp. Both are written in TypeScript.

- [calcom/cal.diy](https://seerepo.com/r/calcom/cal.diy): Scheduling infrastructure for absolutely everyone.
- [liketrek/TREK](https://seerepo.com/r/liketrek/TREK): The most complete open-source travel planner: real-time collaboration, bookings, budgets, packing lists, journals, offline PWA, SSO and an AI-ready MCP server, with planet-wide place search and routing built in.

## What they share and what sets them apart

- In common: @nestjs/core, NestJS, React, kysely, helmet, Zod, Tailwind CSS, Lucide, bcryptjs, otplib, qrcode, nodemailer, jimp, sharp
- Only in cal.diy: connect, Next.js, Postgres, @nestjs/bull, @nest-lab/throttler-storage-redis, bull, Redis, Google, Sentry, Stripe, @next/third-parties, Vercel, PostHog, @trpc/server, tRPC, lru-cache, next-auth, class-validator, class-transformer, nest-winston, tslog, winston, winston-transport, classnames, next-themes, class-variance-authority, React Hook Form, TanStack, sonner, Framer, @formkit/auto-animate, Radix UI, react-select, react-inlinesvg, react-sticky-box, jose, markdown-it, node-html-parser, react-qr-code, @hookform/resolvers, ink, ink-text-input, ink-select-input, ical.js, tailwind-merge, Base UI, entities, handlebars, dompurify, remove-markdown, sanitize-html, turndown, marked, Prisma, node-ical, lexical, react-easy-crop, cmdk, react-colorful, react-day-picker, @lexical/markdown
- Only in TREK: Vite, React Router, dexie, Express, SQLite, fontsource, Leaflet, react-leaflet, Mapbox, MapLibre, plyr, react-dropzone, @simplewebauthn/browser, @assistant-ui/react, react-markdown, remark-gfm, remark-breaks, rehype-sanitize, heic-to, modern-screenshot, @clack/prompts, mikro-orm, jsonwebtoken, @simplewebauthn/server, fast-xml-parser, pdf-parse, exifr, nestjs-zod, isomorphic-dompurify

## Side by side

| | cal.diy | TREK |
|---|---|---|
| Size | 554,567 lines written, 4,308 code files | 2,173,833 lines written, 7,272 code files |
| Who writes it | 6.3% of its commits signed by AI. With Devin, Claude Code, CodeRabbit, Cursor, and GitHub Copilot | 1.3% 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 8, 2026, 4,393 commits, 15,430 stars |
| Tests | 644 test files. 14.8% of its code files have a test that imports them | 3,464 test files. 47.8% 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, cal.diy or TREK?

TREK, with 2,173,833 lines written; cal.diy has 554,567.

The proof: [liketrek/TREK's code at commit dc36c21](https://github.com/liketrek/TREK/tree/dc36c21c08f681fd2806764fad8e17b270f6f175)

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

cal.diy, with 49,716 stars; TREK has 15,430.

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

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

TREK, with 3,464 test files; cal.diy has 644.

The proof: [liketrek/TREK's code at commit dc36c21](https://github.com/liketrek/TREK/tree/dc36c21c08f681fd2806764fad8e17b270f6f175)

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

TREK: its last push was on November 8, 2026, and cal.diy's on November 3, 2026.

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

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

cal.diy: an AI signed 6.3% of its commits, with Devin, Claude Code, CodeRabbit, Cursor, and GitHub Copilot; in TREK, 1.3%.

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 5, 2026, at commit 2eb48ec (https://github.com/calcom/cal.diy/tree/2eb48eccd8aca8a0c0ffabf28cf92e298b33ecee)
- liketrek/TREK: Read on November 8, 2026, at commit dc36c21 (https://github.com/liketrek/TREK/tree/dc36c21c08f681fd2806764fad8e17b270f6f175)

## 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.