Source: https://seerepo.com/compare/herdrdev/herdr/vs/openai/codex
Markdown source: https://seerepo.com/compare/herdrdev/herdr/vs/openai/codex.md
Description: herdr and codex share 7 technologies: Tokio, Ratatui, crossterm, png, schemars, tracing, and tracing-subscriber. Both are written in Rust.

# herdr vs codex

herdr and codex share 7 technologies: Tokio, Ratatui, crossterm, png, schemars, tracing, and tracing-subscriber. Both are written in Rust.

- [herdrdev/herdr](https://seerepo.com/r/herdrdev/herdr): the runtime your coding agents live on
- [openai/codex](https://seerepo.com/r/openai/codex): Lightweight coding agent that runs in your terminal

## What they share and what sets them apart

- In common: Tokio, Ratatui, crossterm, png, schemars, tracing, tracing-subscriber
- Only in herdr: jsonc-parser
- Only in codex: axum, lru, SQLite, Sentry, tower, objc2-app-kit, objc2-foundation, keyring, hmac, rmcp, image, pulldown-cmark, zip, Pydantic, log, tracing-appender

## Side by side

| | herdr | codex |
|---|---|---|
| Size | 339,816 lines written, 365 code files | 2,320,674 lines written, 4,216 code files |
| Who writes it | 0.3% of its commits signed by AI. With Claude Code, Factory, GitHub Copilot, and Cursor | 2.8% of its commits signed by AI. With Codex, Claude Code, and GitHub Copilot |
| Activity | Last push November 3, 2026, 1,875 commits, 48,295 stars | Last push November 4, 2026, 13,099 commits, 133,103 stars |
| Tests | 105 test files. 40.3% of its code files have a test that imports them | 2,448 test files. 51.6% 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, herdr or codex?

codex, with 2,320,674 lines written; herdr has 339,816.

The proof: [openai/codex's code at commit 021fccb](https://github.com/openai/codex/tree/021fccb046508938c4754982efccfb51d6e8356e)

### Which has more GitHub stars, herdr or codex?

codex, with 133,103 stars; herdr has 48,295.

The proof: [openai/codex on GitHub](https://github.com/openai/codex)

### Which has more tests, herdr or codex?

codex, with 2,448 test files; herdr has 105.

The proof: [openai/codex's code at commit 021fccb](https://github.com/openai/codex/tree/021fccb046508938c4754982efccfb51d6e8356e)

### Which was updated more recently, herdr or codex?

codex: its last push was on November 4, 2026, and herdr's on November 3, 2026.

The proof: [openai/codex's commits on GitHub](https://github.com/openai/codex/commits)

### Which has more commits signed by AI, herdr or codex?

codex: an AI signed 2.8% of its commits, with Codex, Claude Code, and GitHub Copilot; in herdr, 0.3%.

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

## Sources

- herdrdev/herdr: Read on November 5, 2026, at commit ee5bfb5 (https://github.com/herdrdev/herdr/tree/ee5bfb5041bb3e4a49d591c72308aae3c81ecdde)
- openai/codex: Read on November 4, 2026, at commit 021fccb (https://github.com/openai/codex/tree/021fccb046508938c4754982efccfb51d6e8356e)

## 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.