Aider

Aider

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Aider is an open-source, terminal-based AI pair programming tool that connects large language models to a local codebase to write, edit, and commit code changes.

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Last Updated Nov 10, 2026
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About

Aider is an open-source command-line tool that lets developers collaborate with large language models (LLMs) directly in their terminal. It addresses a common frustration with AI coding assistants: applying an LLM's suggested changes to real files without endless copy-pasting. Aider edits source files in a project, describes what it changed, and manages version control alongside the developer.

The tool works by taking a request in chat form, building a map of the repository so it understands how files relate to one another, and then making targeted edits. It automatically commits each change to Git with a descriptive message, so every AI modification can be reviewed, diffed, or undone with standard Git commands. Aider is distributed as a Python package and connects to cloud LLM APIs or locally hosted models. The project is maintained publicly on GitHub and is free to use, though users supply their own model access.

Key Features

Cloud and local LLMs: Aider works best with Claude 3.7 Sonnet, DeepSeek R1 and Chat V3, and OpenAI's o1, o3-mini, and GPT-4o, and it can connect to almost any LLM, including models running locally.
Codebase mapping: Aider builds a map of the entire repository, which helps it make coherent edits in larger projects rather than working file by file in isolation.
Support for 100+ languages: It handles most popular programming languages, including Python, JavaScript, Rust, Ruby, Go, C++, PHP, HTML, and CSS.
Git integration: Every change is committed automatically with a sensible commit message, and developers can use familiar Git tools to diff, manage, or undo AI edits.
IDE-friendly workflow: Users can run Aider inside their preferred editor and request changes by adding comments directly in the code.
Images, web pages, and voice: Screenshots, reference documentation, and web pages can be added to the chat for context, and voice input lets developers request features, tests, or bug fixes by speaking.
Automatic linting and testing: Aider runs linters and test suites after each edit and can fix the problems it detects.

Pricing & Fees

  • Pricing: Not publicly listed on the pages we reviewed; check the official site for current plans.
  • Open source and free to install: Aider is installed via `python -m pip install aider-install` and is available on GitHub.
  • Flexible model access: Users bring their own API keys (for example, DeepSeek, Anthropic, or OpenAI) or connect a local model.
  • Web-chat fallback: For those without API access, Aider streamlines copying code back and forth between the terminal and a browser-based LLM chat.

Who It's For

Aider is aimed at developers who live in the terminal and want an LLM to make direct, version-controlled edits to real projects. Typical users include backend and full-stack engineers maintaining existing codebases, open-source contributors adding features or tests, and solo developers prototyping new applications. It suits anyone who wants AI-generated changes committed cleanly to Git, automatically linted and tested, and reversible with standard tooling. Developers who prefer local models for privacy or cost reasons can also use it with locally hosted LLMs instead of cloud APIs.

FAQ

What is Aider?Aider is an open-source AI pair programming tool that runs in the terminal, letting developers collaborate with LLMs to start new projects or modify existing codebases with automatic Git commits.

Is Aider free to use?The Aider software itself is free and open source; however, it does not publish pricing on the pages reviewed, and users typically provide their own LLM API keys or run local models.

Which models does Aider support?It performs best with Claude 3.7 Sonnet, DeepSeek R1 and Chat V3, and OpenAI o1, o3-mini, and GPT-4o, but it can connect to almost any LLM, including locally hosted models.

Does Aider work with my editor and programming language?Aider can be used from within an IDE or editor and supports more than 100 languages, including Python, JavaScript, Rust, Go, and C++.

How does Aider keep AI changes under control?It commits every edit to Git with descriptive messages, runs linters and tests after changes, and can attempt fixes for any problems those checks detect.

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