Aider is a free, open-source command-line AI coding tool that connects to your git repo and edits files directly. It works with any AI model (GPT-4o, Claude, etc.) and has strong multi-file editing, test-running and commit support. Popular with developers who prefer terminal workflows.
Best for
Developers who want a free, open-source, terminal-based AI coding assistant.
Pros
- Completely free and open-source, with no vendor lock-in on which AI model you use
- Edits files directly in your git repo with built-in commit support — a genuinely different, faster workflow for terminal users
- Strong multi-file editing and test-running support
Cons
- Terminal-first workflow has a learning curve if you're used to a GUI editor
- You still need your own API key/billing for whichever underlying model you connect it to
Tags
open-sourceterminalcligitmulti-filefree
Frequently asked questions
Does Aider come with its own AI model?
No — it's free and open-source, but you bring your own API key for the model you want to use (GPT-4o, Claude, etc.), so there's still a usage cost from that provider.
