Source: https://seerepo.com/compare/calcom/cal.diy/vs/multica-ai/multica
Markdown source: https://seerepo.com/compare/calcom/cal.diy/vs/multica-ai/multica.md
Description: cal.diy and multica share 5 technologies: Next.js, React, Postgres, Redis, and PostHog. cal.diy is written in TypeScript and multica in Go.

# cal.diy vs multica

cal.diy and multica share 5 technologies: Next.js, React, Postgres, Redis, and PostHog. cal.diy is written in TypeScript and multica in Go.

- [calcom/cal.diy](https://seerepo.com/r/calcom/cal.diy): Scheduling infrastructure for absolutely everyone.
- [multica-ai/multica](https://seerepo.com/r/multica-ai/multica): Make humans and AI agents work as one team — open-source and self-hostable.

## What they share and what sets them apart

- In common: Next.js, React, Postgres, Redis, PostHog
- Only in cal.diy: Sentry, Google, Stripe
- Only in multica: Expo, chi, net/http, Resend, OpenAI

## Side by side

| | cal.diy | multica |
|---|---|---|
| Size | 554,251 lines written, 4,310 code files | 1,347,852 lines written, 2,534 code files |
| Who writes it | 6.3% of its commits signed by AI. With Devin, Claude Code, CodeRabbit, Cursor, and GitHub Copilot | 35.6% of its commits signed by AI. With Claude Code, Codex, Cursor, and GitHub Copilot |
| Activity | Last push October 27, 2026, 16,059 commits, 49,471 stars | Last push October 28, 2026, 5,228 commits, 54,065 stars |
| Tests | 641 test files. 14.7% of its code files have a test that imports them | 2,243 test files. 62.6% 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 multica?

multica, with 1,347,852 lines written in 2,534 code files; cal.diy has 554,251 in 4,310.

The proof: [multica-ai/multica's code at commit 4a0c147](https://github.com/multica-ai/multica/tree/4a0c147c5020db450fd24459a0da6014fbb9a3d2)

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

multica, with 54,065 stars; cal.diy has 49,471.

The proof: [multica-ai/multica on GitHub](https://github.com/multica-ai/multica)

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

multica, with 2,243 test files; cal.diy has 641.

The proof: [multica-ai/multica's code at commit 4a0c147](https://github.com/multica-ai/multica/tree/4a0c147c5020db450fd24459a0da6014fbb9a3d2)

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

multica: its last push was on October 28, 2026, and cal.diy's on October 27, 2026.

The proof: [multica-ai/multica's commits on GitHub](https://github.com/multica-ai/multica/commits)

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

multica: an AI signed 35.6% of its commits, with Claude Code, Codex, Cursor, and GitHub Copilot; in cal.diy, 6.3%.

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

## Sources

- calcom/cal.diy: Read on October 28, 2026, at commit 56da01b (https://github.com/calcom/cal.diy/tree/56da01b4b1664894b784aca636eccab0c56cc141)
- multica-ai/multica: Read on October 28, 2026, at commit 4a0c147 (https://github.com/multica-ai/multica/tree/4a0c147c5020db450fd24459a0da6014fbb9a3d2)

## 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.