Source: https://seerepo.com/compare/calcom/cal.diy/vs/elie222/inbox-zero
Markdown source: https://seerepo.com/compare/calcom/cal.diy/vs/elie222/inbox-zero.md
Description: cal.diy and inbox-zero share 26 technologies: Next.js, Postgres, Redis, Sentry, Stripe, React, Vercel, PostHog, Zod, Tailwind CSS, next-themes, class-variance-authority, React Hook Form, TanStack, sonner, Framer, Radix UI, Lucide, jose, @hookform/resolvers, ical.js, tailwind-merge, nodemailer, dompurify, cmdk, and react-day-picker. Both are written in TypeScript.

# cal.diy vs inbox-zero

cal.diy and inbox-zero share 26 technologies: Next.js, Postgres, Redis, Sentry, Stripe, React, Vercel, PostHog, Zod, Tailwind CSS, next-themes, class-variance-authority, React Hook Form, TanStack, sonner, Framer, Radix UI, Lucide, jose, @hookform/resolvers, ical.js, tailwind-merge, nodemailer, dompurify, 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.
- [elie222/inbox-zero](https://seerepo.com/r/elie222/inbox-zero): The world's best AI personal assistant for email. Open source app to help you reach inbox zero fast.

## What they share and what sets them apart

- In common: Next.js, Postgres, Redis, Sentry, Stripe, React, Vercel, PostHog, Zod, Tailwind CSS, next-themes, class-variance-authority, React Hook Form, TanStack, sonner, Framer, Radix UI, Lucide, jose, @hookform/resolvers, ical.js, tailwind-merge, nodemailer, dompurify, cmdk, react-day-picker
- Only in cal.diy: connect, NestJS, @nestjs/bull, @nest-lab/throttler-storage-redis, bull, Google, @next/third-parties, @trpc/server, @jetstreamapp/soql-parser-js, tRPC, lru-cache, kysely, next-auth, helmet, class-validator, class-transformer, @axiomhq/winston, nest-winston, tslog, winston, winston-transport, classnames, @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, otplib, mailhog, markdown-it, node-html-parser, qrcode, react-qr-code, @todesktop/client-core, ink, ink-text-input, ink-select-input, @googleapis/oauth2, Base UI, entities, handlebars, @trigger.dev/sdk, @sendgrid/client, jimp, remove-markdown, sanitize-html, sharp, turndown, marked, Prisma, node-ical, lexical, react-easy-crop, react-colorful, @lexical/markdown
- Only in inbox-zero: Electron, @chat-adapter/state-ioredis, bullmq, SQLite, MCP, OpenAI, QStash, Anthropic, Apple, Braintrust, Gmail, Perplexity, Loops, Resend, motion, tiptap, usehooks-ts, Headless UI, react-hotkeys-hook, react-textarea-autosize, recharts, @mux/mux-player-react, crisp-sdk-web, react-resizable-panels, react-syntax-highlighter, use-stick-to-bottom, Better Auth, ai, ai-sdk, chat, @posthog/ai, ollama-ai-provider-v2, OpenRouter, Cheerio, he, @react-email/render, html-to-text, @tiptap/markdown, fast-xml-parser, streamdown, email-reply-parser, gmail-api-parse-message, mammoth, postal-mime, unpdf, next-safe-action, next-axiom, serwist, @clack/prompts, squire-rte, parse5, linkify-it, react-email

## Side by side

| | cal.diy | inbox-zero |
|---|---|---|
| Size | 554,567 lines written, 4,285 code files | 733,800 lines written, 2,514 code files |
| Who writes it | 6.3% of its commits signed by AI. With Devin, Claude Code, CodeRabbit, Cursor, and GitHub Copilot | 14.7% of its commits signed by AI. With Claude Code, Cursor, CodeRabbit, and Codex |
| Activity | Last push November 3, 2026, 16,069 commits, 49,876 stars | Last push November 10, 2026, 10,459 commits, 12,966 stars |
| Tests | 644 test files. 14.8% of its code files have a test that imports them | 1,352 test files. 47.3% 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 inbox-zero?

inbox-zero, with 733,800 lines written; cal.diy has 554,567.

The proof: [elie222/inbox-zero's code at commit 845ed68](https://github.com/elie222/inbox-zero/tree/845ed686eb065901c942bcb3e9076dffb218c6a2)

### Which has more GitHub stars, cal.diy or inbox-zero?

cal.diy, with 49,876 stars; inbox-zero has 12,966.

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

### Which has more tests, cal.diy or inbox-zero?

inbox-zero, with 1,352 test files; cal.diy has 644.

The proof: [elie222/inbox-zero's code at commit 845ed68](https://github.com/elie222/inbox-zero/tree/845ed686eb065901c942bcb3e9076dffb218c6a2)

### Which was updated more recently, cal.diy or inbox-zero?

inbox-zero: its last push was on November 10, 2026, and cal.diy's on November 3, 2026.

The proof: [elie222/inbox-zero's commits on GitHub](https://github.com/elie222/inbox-zero/commits)

### Which has more commits signed by AI, cal.diy or inbox-zero?

inbox-zero: an AI signed 14.7% of its commits, with Claude Code, Cursor, CodeRabbit, and Codex; in cal.diy, 6.3%.

The proof: [the commits each tool signed in elie222/inbox-zero](https://seerepo.com/r/elie222/inbox-zero/ai)

## Sources

- calcom/cal.diy: Read on November 10, 2026, at commit 2eb48ec (https://github.com/calcom/cal.diy/tree/2eb48eccd8aca8a0c0ffabf28cf92e298b33ecee)
- elie222/inbox-zero: Read on November 10, 2026, at commit 845ed68 (https://github.com/elie222/inbox-zero/tree/845ed686eb065901c942bcb3e9076dffb218c6a2)

## 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.