coding
Aider
Open-source AI pair programming in your terminal.
aider.chat ↗CLI · macOS · Windows · Linux
what it is
Aider is a free, open-source tool that lets you pair program with an AI model from your terminal. You run it inside a git repo, tell it what to change, and it edits your files directly. It works with many model providers, such as Claude, DeepSeek and OpenAI.
who it's for
Developers comfortable in the terminal who want a lightweight, open-source coding assistant with their own API keys.
how to start
- 1Make sure Python 3.8–3.13 is installed.
- 2Install: python -m pip install aider-install, then run aider-install (or use the one-line installer: curl -LsSf aider.chat/install.sh | sh).
- 3cd into your project.
- 4Start it with your model and key, for example: aider --model deepseek --api-key deepseek=<key>
- 5Type the change you want; aider edits the files.
what you need
- Python 3.8–3.13
- An API key from a model provider (for example Anthropic, OpenAI or DeepSeek)
- A code project (ideally a git repo)
pricing
Aider itself is free and open source
You pay your model provider for API usage
checked Oct 10, 2026
key features
- Edits files in your local repo from chat
- Works with many LLM providers
- Git-aware
- Free and open source