Cydonia vs the Codex app
The Codex app runs OpenAI's Codex and needs a ChatGPT account or an API key. Cydonia runs Codex next to Claude Code, Cursor, OpenCode and any ACP agent, and keeps their work as articles and boards.
Checked against each product's own site on
The Codex app is OpenAI's own window onto Codex. Cydonia runs Codex too, through its ACP adapter, alongside agents from other vendors.
| Cydonia | Codex app | |
|---|---|---|
| License | MIT | Not checked |
| Platforms | macOS, Linux, Windows | macOS on Apple silicon, Windows, Linux |
| Agents | Codex, Claude Code, Cursor, OpenCode, pi and the rest of the ACP registry | Codex |
| Account | None for Cydonia; each agent signs in its own way | A ChatGPT account, or an API key |
| Scheduled tasks | No | Yes |
| Boards and documents | Articles, boards and tables in .cydonia/ in the project |
No boards |
| Price | Free | Free, Go, Plus, Pro and Business plans |
When to pick the Codex app
- You use Codex alone and want OpenAI's own app, with scheduled tasks.
When to pick Cydonia
- You run more than one vendor's agent and want them side by side in one window.
- You want work handed out from a board, and what agents find kept as articles in the project.
- You want the source, under MIT.