Source: https://seerepo.com/r/openai/codex/built
Markdown source: https://seerepo.com/r/openai/codex/built.md
Description: codex is a Rust repo built with axum. It stores its data in SQLite and watches its errors with Sentry.

# What is codex built with?

codex is a Rust repo built with axum. It stores its data in SQLite and watches its errors with Sentry. It has 4,202 files and 2,310,690 written lines, with 2,441 test files.

Read on November 3, 2026, at commit f1b0721.

Repository: https://github.com/openai/codex

## Backend

### The base

- **[axum](https://seerepo.com/uses/axum)**

### Data

- **[SQLite](https://seerepo.com/uses/sqlite)**: 2 files · [codex-rs/state/src/migrations.rs, line 5](https://github.com/openai/codex/blob/f1b0721c88002066201e7d977c449fbf14f1e499/codex-rs/state/src/migrations.rs#L5)

### Services

- **[Sentry](https://seerepo.com/uses/sentry)**: 3 files · [codex-rs/feedback/src/lib.rs, line 566](https://github.com/openai/codex/blob/f1b0721c88002066201e7d977c449fbf14f1e499/codex-rs/feedback/src/lib.rs#L566)

## Other repos with a similar stack

- [n8n-io/n8n](https://seerepo.com/r/n8n-io/n8n/built): SQLite, Sentry
- [langgenius/dify](https://seerepo.com/r/langgenius/dify/built): SQLite, Sentry
- [farion1231/cc-switch](https://seerepo.com/r/farion1231/cc-switch/built): axum, SQLite
- [tinyhumansai/openhuman](https://seerepo.com/r/tinyhumansai/openhuman/built): axum, Sentry
- [langfuse/langfuse](https://seerepo.com/r/langfuse/langfuse/built): axum, Sentry
- [seaweedfs/seaweedfs](https://seerepo.com/r/seaweedfs/seaweedfs/built): axum, Sentry

## Frequently asked questions

### What language is codex written in?

codex is written in Rust: 4,202 files and 2,310,690 written lines.

### What framework does codex use?

codex is built with axum.

### What database does codex use?

codex stores its data in SQLite.

The proof: [codex-rs/state/src/migrations.rs, line 5](https://github.com/openai/codex/blob/f1b0721c88002066201e7d977c449fbf14f1e499/codex-rs/state/src/migrations.rs#L5)

### What services does codex use?

codex watches its errors with Sentry.

The proof: [codex-rs/feedback/src/lib.rs, line 566](https://github.com/openai/codex/blob/f1b0721c88002066201e7d977c449fbf14f1e499/codex-rs/feedback/src/lib.rs#L566)

### Does codex have tests?

Yes. codex has 2,441 test files.

### Which repos have a stack like codex's?

The ones that share most of its stack: n8n-io/n8n, langgenius/dify, and farion1231/cc-switch.

## 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.