Source: https://seerepo.com/compare/calcom/cal.diy/vs/midday-ai/midday
Markdown source: https://seerepo.com/compare/calcom/cal.diy/vs/midday-ai/midday.md
Description: cal.diy and midday share 26 technologies: Next.js, Postgres, Google, Sentry, Stripe, React, @trpc/server, tRPC, lru-cache, Zod, Tailwind CSS, next-themes, class-variance-authority, React Hook Form, TanStack, Framer, Radix UI, Lucide, jose, qrcode, @hookform/resolvers, tailwind-merge, sharp, cmdk, react-colorful, and react-day-picker. Both are written in TypeScript.

# cal.diy vs midday

cal.diy and midday share 26 technologies: Next.js, Postgres, Google, Sentry, Stripe, React, @trpc/server, tRPC, lru-cache, Zod, Tailwind CSS, next-themes, class-variance-authority, React Hook Form, TanStack, Framer, Radix UI, Lucide, jose, qrcode, @hookform/resolvers, tailwind-merge, sharp, cmdk, react-colorful, and react-day-picker. Both are written in TypeScript.

- [calcom/cal.diy](https://seerepo.com/r/calcom/cal.diy): Scheduling infrastructure for absolutely everyone.
- [midday-ai/midday](https://seerepo.com/r/midday-ai/midday): Invoicing, Time tracking, File reconciliation, Storage, Financial Overview & your own Assistant made for Freelancers

## What they share and what sets them apart

- In common: Next.js, Postgres, Google, Sentry, Stripe, React, @trpc/server, tRPC, lru-cache, Zod, Tailwind CSS, next-themes, class-variance-authority, React Hook Form, TanStack, Framer, Radix UI, Lucide, jose, qrcode, @hookform/resolvers, tailwind-merge, sharp, cmdk, react-colorful, react-day-picker
- Only in cal.diy: connect, @nestjs/core, @nestjs/bull, @nest-lab/throttler-storage-redis, bull, Redis, NestJS, @next/third-parties, Vercel, PostHog, kysely, next-auth, helmet, class-validator, class-transformer, nest-winston, tslog, winston, winston-transport, classnames, sonner, @formkit/auto-animate, react-select, react-inlinesvg, react-sticky-box, bcryptjs, otplib, markdown-it, node-html-parser, react-qr-code, ink, ink-text-input, ink-select-input, ical.js, Base UI, entities, nodemailer, handlebars, dompurify, jimp, remove-markdown, sanitize-html, turndown, marked, Prisma, node-ical, lexical, react-easy-crop, @lexical/markdown
- Only in midday: Hono, Supabase, MCP, OpenAI, Anthropic, Resend, Vite, Tauri, Tokio, bullmq, @slack/bolt, @tauri-apps/api, Scalar, ai, chat, @ai-sdk/mcp, @composio/core, @trigger.dev/sdk, usehooks-ts, react-hotkeys-hook, dnd-kit, @number-flow/react, recharts, react-dropzone, tiptap, react-number-format, react-zoom-pan-pinch, @react-google-maps/api, lottie-react, react-intersection-observer, tippy.js, use-stick-to-bottom, react-icons, @ai-sdk/react, papaparse, react-pdf, streamdown, react-markdown, next-safe-action, tauri-plugin-dialog, image, @ai-sdk/google, @fast-csv/format, heic-convert, node-xlsx, @t3-oss/env-core, ora, escape-html, Drizzle, ai-sdk, LangChain, officeparser, unpdf, react-email, @react-pdf/renderer, pino, embla-carousel-react, input-otp, vaul, @radix-ui/react-icons, xyflow, dagre

## Side by side

| | cal.diy | midday |
|---|---|---|
| Size | 554,567 lines written, 4,308 code files | 350,070 lines written, 1,715 code files |
| Who writes it | 6.3% of its commits signed by AI. With Devin, Claude Code, CodeRabbit, Cursor, and GitHub Copilot | 1.2% of its commits signed by AI. With Cursor and Claude Code |
| Activity | Last push November 3, 2026, 16,069 commits, 49,716 stars | Last push June 13, 2026, 3,702 commits, 15,116 stars |
| Tests | 644 test files. 14.8% of its code files have a test that imports them | 101 test files. 5.2% 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 midday?

cal.diy, with 554,567 lines written; midday has 350,070.

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 midday?

cal.diy, with 49,716 stars; midday has 15,116.

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

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

cal.diy, with 644 test files; midday has 101.

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 midday?

cal.diy: its last push was on November 3, 2026, and midday's on June 13, 2026.

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

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

cal.diy: an AI signed 6.3% of its commits, with Devin, Claude Code, CodeRabbit, Cursor, and GitHub Copilot; in midday, 1.2%.

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)
- midday-ai/midday: Read on November 8, 2026, at commit 5158731 (https://github.com/midday-ai/midday/tree/51587319f26a0ffaa9dfccab1920373cb65689b7)

## 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.