OpenAI Codex
- Use it for
- Coding agent that works on your repository in the cloud or terminal.
- Pricing
- Included with paid ChatGPT plans.
- Operator's verdict
- Capable for well-specified tasks. Same rule: spec first.
- Official site
- https://openai.com/codex/ ↗
Building a fitness app with OpenAI Codex? The tool matters less than the spec you hand it. Get the free client-intake spec →
More ai code editors & agents
AI code editors & agents
Cursor
AI code editor that edits your whole project; reads .cursorrules for fitness context.
verdict › The step up once you own your code. Not where a first-timer should start.
Free tier; Pro subscription.
cursor.com ↗AI code editors & agents
Claude Code
Terminal agent that builds and fixes apps from your folder; reads CLAUDE.md.
verdict › The most capable agent for a long build if you can open a terminal. Feed it a spec.
Included with paid Claude plans or API usage.
www.anthropic.com/claude-code ↗AI code editors & agents
Windsurf
AI editor with an agent that plans and makes multi-file changes.
verdict › A credible Cursor alternative. Pick one and stick with it.
Free tier; paid plans.
windsurf.com ↗