Source: https://seerepo.com/compare/alan2207/bulletproof-react/vs/calcom/cal.diy
Markdown source: https://seerepo.com/compare/alan2207/bulletproof-react/vs/calcom/cal.diy.md
Description: bulletproof-react and cal.diy share 12 technologies: React, Next.js, Tailwind CSS, class-variance-authority, tailwind-merge, Radix UI, React Hook Form, Lucide, marked, Zod, @hookform/resolvers, and dompurify. Both are written in TypeScript.

# bulletproof-react vs cal.diy

bulletproof-react and cal.diy share 12 technologies: React, Next.js, Tailwind CSS, class-variance-authority, tailwind-merge, Radix UI, React Hook Form, Lucide, marked, Zod, @hookform/resolvers, and dompurify. Both are written in TypeScript.

- [alan2207/bulletproof-react](https://seerepo.com/r/alan2207/bulletproof-react): 🛡️ ⚛️ A simple, scalable, and powerful architecture for building production ready React applications. 
- [calcom/cal.diy](https://seerepo.com/r/calcom/cal.diy): Scheduling infrastructure for absolutely everyone.

## What they share and what sets them apart

- In common: React, Next.js, Tailwind CSS, class-variance-authority, tailwind-merge, Radix UI, React Hook Form, Lucide, marked, Zod, @hookform/resolvers, dompurify
- Only in bulletproof-react: Express, Vite, React Router, react-error-boundary, @radix-ui/react-icons, isomorphic-dompurify, pino-http, react-helmet-async
- Only in cal.diy: connect, @nestjs/core, Postgres, @nestjs/bull, @nest-lab/throttler-storage-redis, bull, Redis, Google, Sentry, Stripe, NestJS, @next/third-parties, Vercel, PostHog, @trpc/server, tRPC, lru-cache, kysely, next-auth, helmet, class-validator, class-transformer, nest-winston, tslog, winston, winston-transport, classnames, next-themes, TanStack, sonner, Framer, @formkit/auto-animate, react-select, react-inlinesvg, react-sticky-box, bcryptjs, jose, otplib, markdown-it, node-html-parser, qrcode, react-qr-code, ink, ink-text-input, ink-select-input, ical.js, Base UI, entities, nodemailer, handlebars, jimp, remove-markdown, sanitize-html, sharp, turndown, Prisma, node-ical, lexical, react-easy-crop, cmdk, react-colorful, react-day-picker, @lexical/markdown

## Side by side

| | bulletproof-react | cal.diy |
|---|---|---|
| Size | 22,882 lines written, 324 code files | 554,567 lines written, 4,308 code files |
| Who writes it | 0% of its commits signed by AI | 6.3% of its commits signed by AI. With Devin, Claude Code, CodeRabbit, Cursor, and GitHub Copilot |
| Activity | Last push May 14, 2026, 220 commits, 36,043 stars | Last push November 3, 2026, 16,069 commits, 49,716 stars |
| Tests | 52 test files. 18.2% of its code files have a test that imports them | 644 test files. 14.8% 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, bulletproof-react or cal.diy?

cal.diy, with 554,567 lines written; bulletproof-react has 22,882.

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

### Which has more GitHub stars, bulletproof-react or cal.diy?

cal.diy, with 49,716 stars; bulletproof-react has 36,043.

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

### Which has more tests, bulletproof-react or cal.diy?

cal.diy, with 644 test files; bulletproof-react has 52.

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

### Which was updated more recently, bulletproof-react or cal.diy?

cal.diy: its last push was on November 3, 2026, and bulletproof-react's on May 14, 2026.

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

### Which has more commits signed by AI, bulletproof-react or cal.diy?

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

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

## Sources

- alan2207/bulletproof-react: Read on November 7, 2026, at commit 9506629 (https://github.com/alan2207/bulletproof-react/tree/9506629ed003a561c6627735480cce4994244bb4)
- calcom/cal.diy: Read on November 5, 2026, at commit 2eb48ec (https://github.com/calcom/cal.diy/tree/2eb48eccd8aca8a0c0ffabf28cf92e298b33ecee)

## 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.