Aider
A terminal-based, Git-integrated AI pair-programmer that edits code across your whole repository using any LLM you configure. Free and open-source — you only pay your model provider directly.
Alternatives
Overview
Aider is an open-source AI pair programmer that runs entirely in your terminal and works directly with your local git repository, making it the tool of choice for developers who want AI coding assistance without a new IDE, a subscription, or sending code to a proprietary cloud service. You point Aider at your codebase, describe the change you want, and it edits the relevant files, stages the changes, and commits them with a descriptive message, all within your existing workflow. It supports multiple AI backends: OpenAI's GPT-4o, Anthropic's Claude models, and locally running models via Ollama or LM Studio.
This backend flexibility is significant: developers running local models keep their code entirely on-device with zero data transmission to external services. Aider performs well on multi-file refactors, feature additions to existing codebases, and bug fixes where the problem and affected files are clearly specified. Its limitations are the lack of a visual interface and the need to manage your own API keys.
For experienced developers comfortable in the terminal who want maximum control and flexibility, Aider represents the most customizable AI coding workflow available.
Key Features
- Terminal-based interface
- Git-aware edits
- Multiple model support
- Voice coding mode
- Commit message generation
- • Open source and self-hostable
- • Excellent git integration
- • Supports many models
- • Active development community
- • Command line only
- • Requires API key from another provider
- • Setup not as smooth as GUI tools
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