Source: https://seerepo.com/compare/calcom/cal.diy/vs/pastelsky/bundlephobia
Markdown source: https://seerepo.com/compare/calcom/cal.diy/vs/pastelsky/bundlephobia.md
Description: cal.diy and bundlephobia share 10 technologies: Next.js, React, lru-cache, Zod, winston, Tailwind CSS, classnames, Lucide, Base UI, and dompurify. Both are written in TypeScript.

# cal.diy vs bundlephobia

cal.diy and bundlephobia share 10 technologies: Next.js, React, lru-cache, Zod, winston, Tailwind CSS, classnames, Lucide, Base UI, and dompurify. Both are written in TypeScript.

- [calcom/cal.diy](https://seerepo.com/r/calcom/cal.diy): Scheduling infrastructure for absolutely everyone.
- [pastelsky/bundlephobia](https://seerepo.com/r/pastelsky/bundlephobia): 🏋️ Find out the cost of adding a new frontend dependency to your project

## What they share and what sets them apart

- In common: Next.js, React, lru-cache, Zod, winston, Tailwind CSS, classnames, Lucide, Base UI, dompurify
- Only in cal.diy: connect, NestJS, Postgres, @nestjs/bull, @nest-lab/throttler-storage-redis, bull, Redis, Google, Sentry, Stripe, @next/third-parties, Vercel, PostHog, @trpc/server, tRPC, kysely, next-auth, helmet, class-validator, class-transformer, @axiomhq/winston, nest-winston, tslog, winston-transport, next-themes, class-variance-authority, React Hook Form, TanStack, sonner, Framer, @formkit/auto-animate, Radix UI, 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, jose, otplib, markdown-it, qrcode, react-qr-code, @hookform/resolvers, @todesktop/client-core, ink, ink-text-input, ink-select-input, @googleapis/oauth2, ical.js, tailwind-merge, entities, nodemailer, bcryptjs, handlebars, @trigger.dev/sdk, @sendgrid/client, jimp, remove-markdown, sanitize-html, sharp, turndown, marked, Prisma, node-html-parser, node-ical, lexical, react-easy-crop, cmdk, react-colorful, react-day-picker, @lexical/markdown
- Only in bundlephobia: Fastify, Koa, Firebase, MCP, GitHub, Vite, react-router-dom, Anime.js, Contentful, d3-path, d3-scale, downshift, fabric, react-dropzone, natural, remark, strip-markdown, prom-client, validate-npm-package-name, @tremor/react

## Side by side

| | cal.diy | bundlephobia |
|---|---|---|
| Size | 554,774 lines written, 4,286 code files | 50,445 lines written, 253 code files |
| Who writes it | 6.3% of its commits signed by AI. With Devin, Claude Code, CodeRabbit, Cursor, and GitHub Copilot | 27.6% of its commits signed by AI. With Codex and Claude Code |
| Activity | Last push November 11, 2026, 16,071 commits, 49,990 stars | Last push November 14, 2026, 855 commits, 9,623 stars |
| Tests | 645 test files. 14.9% of its code files have a test that imports them | 69 test files. 32% 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 bundlephobia?

cal.diy, with 554,774 lines written; bundlephobia has 50,445.

The proof: [calcom/cal.diy's code at commit ef7954d](https://github.com/calcom/cal.diy/tree/ef7954d16ab50882ca2f263c551537115b8a8bb1)

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

cal.diy, with 49,990 stars; bundlephobia has 9,623.

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

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

cal.diy, with 645 test files; bundlephobia has 69.

The proof: [calcom/cal.diy's code at commit ef7954d](https://github.com/calcom/cal.diy/tree/ef7954d16ab50882ca2f263c551537115b8a8bb1)

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

bundlephobia: its last push was on November 14, 2026, and cal.diy's on November 11, 2026.

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

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

bundlephobia: an AI signed 27.6% of its commits, with Codex and Claude Code; in cal.diy, 6.3%.

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

## Sources

- calcom/cal.diy: Read on November 13, 2026, at commit ef7954d (https://github.com/calcom/cal.diy/tree/ef7954d16ab50882ca2f263c551537115b8a8bb1)
- pastelsky/bundlephobia: Read on November 14, 2026, at commit 2a7d5b6 (https://github.com/pastelsky/bundlephobia/tree/2a7d5b6d69e8036509c5a507a1ee39f147230233)

## 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.