Aider

Aider is an open source command-line tool that enables users to pair program with large language models directly in their terminal and local git repositories. It builds a map of the codebase, edits files in place, and automatically commits changes with sensible messages for review and reversal. The software is released under the Apache 2.0 license and requires users to supply their own model API keys.

• Pair program with cloud and local large language models directly in the terminal
• Builds a map of the entire codebase to support larger projects
• Supports over 100 programming languages including python, javascript, rust, ruby, go, cpp, php, html, and css
• Automatically commits changes with sensible commit messages using git integration
• Supports usage from within favorite IDEs or editors by adding comments to code
• Accepts images and web pages in the chat to provide visual context, screenshots, and reference documentation
• Includes voice-to-code capabilities to request new features, test cases, or bug fixes by speaking
• Automatically lints and tests code after changes, fixing problems detected by linters and test suites

Pros

• Integrates directly with git to make every step reviewable, reversible, and manageable with familiar diff tools
• Connects to a wide variety of LLMs, specifically working well with Claude 3.7 Sonnet, DeepSeek R1 and Chat V3, OpenAI o1, o3-mini, and GPT-4o, as well as local models
• Operates across more than 100 popular programming languages for broad codebase compatibility
• Provides a web chat copy and paste workflow option for users who prefer interacting via a browser interface

Cons

• Users must supply their own model API keys to operate the tool
• Works best with LLM APIs or web chat interfaces, meaning external service availability and costs depend on the chosen model provider
• Requires command-line interaction and git familiarity to fully utilize its automated commit and diff management

Aider fits software developers and technical users who work in a terminal environment and want an AI assistant integrated directly into their local git repositories and codebases. It is well suited for developers working across Python, JavaScript, Rust, Go, and dozens of other popular languages who want automated git commits and inline file editing. It is a poor fit for non-technical users who require a standalone graphical application without a command-line interface or git integration.

The listing states the product is free and open source under the Apache 2.0 license. Users must supply their own model API keys, and pricing details for those underlying models are not published on the page.

Unlike typical browser-based AI chat interfaces that require manual file copying, Aider operates directly inside the terminal and your local git repository. It builds a comprehensive map of your entire codebase rather than just handling isolated snippets, and it edits files in place while generating automatic git commits. It also bridges the terminal experience with your IDE, allowing you to trigger changes through code comments.

Python, JavaScript, Rust, Ruby, Go, Cpp, PHP, HTML, CSS, Claude 3.7 Sonnet, DeepSeek R1, DeepSeek Chat V3, OpenAI o1, OpenAI o3-mini, GPT-4o, local models, and various IDEs or editors.