Aider

★★★★☆4.4 / 5 editorial Free Free and open source — your only cost is the API usage of whichever model you connect.

Terminal pair programming with AI — edits and commits in your git repo

✓ Editor-researched listing — details reviewed by Grab AI Tool editors; pricing re-checked regularly.

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#terminal#git#pair programming#open source#refactoring

What is Aider?

Aider is an open-source command-line tool that lets you pair program with leading AI models directly in your terminal. You point it at files in a git repository, describe the change you want, and it edits the code and commits the result with sensible messages, keeping a clean history you can review, amend, or roll back.

It builds a map of your whole repository so the model understands how files connect, and it works with models from OpenAI, Anthropic, Google, DeepSeek, and local providers. Aider is free — your only cost is model API usage — and it suits developers who live in the terminal and want tight control over every change the AI makes.

Who Aider Is Best For

Best for: Aider is a strong fit for developers and engineering teams: Beloved by terminal-first developers; git-native workflow makes changes easy to audit. It is completely free, so there is no budget decision to make.

Not ideal for: Not the ideal pick where these matter most: no graphical interface — command line only; API costs can surprise heavy users.

Key Features

Edit code by chatting in your terminal
Automatic git commits with clear messages
Repository map for whole-codebase awareness
Works with cloud and local models
Voice input and image context for tasks

Pros

Beloved by terminal-first developers
Git-native workflow makes changes easy to audit
Excellent with strong models on real codebases

Cons

No graphical interface — command line only
API costs can surprise heavy users
You manage your own model keys and setup

Pricing

Model: Free
Free and open source — your only cost is the API usage of whichever model you connect.

Adding Up Your AI Bill?

If you pay for Aider alongside other AI subscriptions, the monthly total adds up quietly. Tick every tool you pay for in our free AI Tool Cost Calculator to see your real monthly and yearly bill — and spot overlaps you can cut. Still choosing? Start with our guide on how to choose the right AI tool.