Source: https://seerepo.com/compare/bluesky-social/atproto/vs/calcom/cal.diy
Markdown source: https://seerepo.com/compare/bluesky-social/atproto/vs/calcom/cal.diy.md
Description: atproto and cal.diy share 15 technologies: Postgres, Redis, lru-cache, React, TanStack, Zod, kysely, jose, sharp, Tailwind CSS, class-variance-authority, tailwind-merge, Base UI, Lucide, and nodemailer. Both are written in TypeScript.

# atproto vs cal.diy

atproto and cal.diy share 15 technologies: Postgres, Redis, lru-cache, React, TanStack, Zod, kysely, jose, sharp, Tailwind CSS, class-variance-authority, tailwind-merge, Base UI, Lucide, and nodemailer. Both are written in TypeScript.

- [bluesky-social/atproto](https://seerepo.com/r/bluesky-social/atproto): Social networking technology created by Bluesky
- [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: Postgres, Redis, lru-cache, React, TanStack, Zod, kysely, jose, sharp, Tailwind CSS, class-variance-authority, tailwind-merge, Base UI, Lucide, nodemailer
- Only in atproto: @aws-sdk/lib-storage, AWS S3, Express, SQLite, Expo, react-native-mmkv, Vite, @opentelemetry/instrumentation-ioredis, @hapi/address, disposable-email-domains-js, @opentelemetry/semantic-conventions, pino, pino-http, OpenTelemetry, @standard-schema/spec, com.nimbusds:nimbus-jose-jwt, react-error-boundary, @hcaptcha/react-hcaptcha, lande, prom-client, @opentelemetry/instrumentation-pg, file-type, @opentelemetry/instrumentation-aws-sdk
- Only in cal.diy: connect, Next.js, NestJS, @nestjs/bull, @nest-lab/throttler-storage-redis, bull, Google, Sentry, Stripe, @next/third-parties, Vercel, PostHog, @trpc/server, tRPC, next-auth, helmet, class-validator, class-transformer, @axiomhq/winston, nest-winston, tslog, winston, winston-transport, classnames, next-themes, React Hook Form, 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, otplib, markdown-it, qrcode, react-qr-code, @hookform/resolvers, @todesktop/client-core, ink, ink-text-input, ink-select-input, @googleapis/oauth2, ical.js, entities, bcryptjs, handlebars, @trigger.dev/sdk, @sendgrid/client, dompurify, jimp, remove-markdown, sanitize-html, turndown, marked, Prisma, node-html-parser, node-ical, lexical, react-easy-crop, cmdk, react-colorful, react-day-picker, @lexical/markdown

## Side by side

| | atproto | cal.diy |
|---|---|---|
| Size | 385,793 lines written, 1,878 code files | 554,774 lines written, 4,286 code files |
| Who writes it | 3.2% of its commits signed by AI. With Claude Code, GitHub Copilot, and Codex | 6.3% of its commits signed by AI. With Devin, Claude Code, CodeRabbit, Cursor, and GitHub Copilot |
| Activity | Last push November 14, 2026, 3,489 commits, 9,728 stars | Last push November 11, 2026, 16,071 commits, 49,990 stars |
| Tests | 556 test files. 22.9% of its code files have a test that imports them | 645 test files. 14.9% 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, atproto or cal.diy?

cal.diy, with 554,774 lines written; atproto has 385,793.

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

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

cal.diy, with 49,990 stars; atproto has 9,728.

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

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

cal.diy, with 645 test files; atproto has 556.

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

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

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

The proof: [bluesky-social/atproto's commits on GitHub](https://github.com/bluesky-social/atproto/commits)

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

cal.diy: an AI signed 6.3% of its commits, with Devin, Claude Code, CodeRabbit, Cursor, and GitHub Copilot; in atproto, 3.2%.

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

## Sources

- bluesky-social/atproto: Read on November 14, 2026, at commit 9f605e0 (https://github.com/bluesky-social/atproto/tree/9f605e0fb117173dea8b5c1e9d6ad13bd6995c7f)
- calcom/cal.diy: Read on November 13, 2026, at commit ef7954d (https://github.com/calcom/cal.diy/tree/ef7954d16ab50882ca2f263c551537115b8a8bb1)

## 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.