Source: https://seerepo.com/compare/calcom/cal.diy/vs/onyx-dot-app/onyx
Markdown source: https://seerepo.com/compare/calcom/cal.diy/vs/onyx-dot-app/onyx.md
Description: cal.diy and onyx share 7 technologies: Next.js, React, Postgres, Redis, Sentry, PostHog, and Stripe. cal.diy is written in TypeScript and onyx in Python.

# cal.diy vs onyx

cal.diy and onyx share 7 technologies: Next.js, React, Postgres, Redis, Sentry, PostHog, and Stripe. cal.diy is written in TypeScript and onyx in Python.

- [calcom/cal.diy](https://seerepo.com/r/calcom/cal.diy): Scheduling infrastructure for absolutely everyone.
- [onyx-dot-app/onyx](https://seerepo.com/r/onyx-dot-app/onyx): Open Source AI Platform - AI Chat with advanced features that works with every LLM

## What they share and what sets them apart

- In common: Next.js, React, Postgres, Redis, Sentry, PostHog, Stripe
- Only in cal.diy: Google
- Only in onyx: Expo, FastAPI, OpenAI, Google Cloud Storage

## Side by side

| | cal.diy | onyx |
|---|---|---|
| Size | 554,284 lines written, 4,310 code files | 1,580,032 lines written, 4,036 code files |
| Who writes it | 6.3% of its commits signed by AI. With Devin, Claude Code, CodeRabbit, Cursor, and GitHub Copilot | 11.6% of its commits signed by AI. With Claude Code, Devin, Cursor, CodeRabbit, GitHub Copilot, and Sweep |
| Activity | Last push October 29, 2026, 16,062 commits, 49,552 stars | Last push November 1, 2026, 11,257 commits, 33,146 stars |
| Tests | 642 test files. 14.8% of its code files have a test that imports them | 3,061 test files. 43.4% 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 onyx?

onyx, with 1,580,032 lines written in 4,036 code files; cal.diy has 554,284 in 4,310.

The proof: [onyx-dot-app/onyx's code at commit 3eb6420](https://github.com/onyx-dot-app/onyx/tree/3eb6420f6c7d6c0a94a0b7107a6138509c6d0f48)

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

cal.diy, with 49,552 stars; onyx has 33,146.

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

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

onyx, with 3,061 test files; cal.diy has 642.

The proof: [onyx-dot-app/onyx's code at commit 3eb6420](https://github.com/onyx-dot-app/onyx/tree/3eb6420f6c7d6c0a94a0b7107a6138509c6d0f48)

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

onyx: its last push was on November 1, 2026, and cal.diy's on October 29, 2026.

The proof: [onyx-dot-app/onyx's commits on GitHub](https://github.com/onyx-dot-app/onyx/commits)

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

onyx: an AI signed 11.6% of its commits, with Claude Code, Devin, Cursor, CodeRabbit, GitHub Copilot, and Sweep; in cal.diy, 6.3%.

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

## Sources

- calcom/cal.diy: Read on October 30, 2026, at commit 2e41247 (https://github.com/calcom/cal.diy/tree/2e412471fc1f42c662005854a47c48128c479b0a)
- onyx-dot-app/onyx: Read on November 1, 2026, at commit 3eb6420 (https://github.com/onyx-dot-app/onyx/tree/3eb6420f6c7d6c0a94a0b7107a6138509c6d0f48)

## 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.