Aider

Aider is an open-source AI pair programming tool that lives in your terminal and edits code directly in your local Git repository. You describe what you want in plain language, and Aider makes the changes across the relevant files.

What it does

Aider works alongside your existing codebase from the command line. You tell it what to build or fix, and it edits the appropriate files, then commits each change to Git so your history stays clean and every edit is reviewable. Because it is model-flexible, you connect your own AI model via an API key and choose the model that suits your work. That Git-native approach keeps you in control while the AI handles the mechanical editing.

Who it’s for

Aider is a natural fit for developers who are comfortable in the terminal and want AI assistance that respects their Git workflow. If you prefer command-line tools and want changes tracked as commits rather than pasted from a chat window, it suits you well. Aider itself is free and open source; you bring your own model API key, so the running cost comes from whichever provider you connect.