Aider

AI pair programmer that codes alongside you in your terminal.

Quick answer

Aider is ai pair programmer that codes alongside you in your terminal. It's free, with paid plans from API costs vary by model provider (e.g., OpenAI or Anthropic pricing).. Best for refactoring large codebases across multiple files at once.

Aider is a free, open-source AI coding assistant that runs directly in your terminal and lets you edit code in your local Git repository using natural language commands. It is designed for developers who want a powerful coding companion without leaving their command-line workflow, making it ideal for backend engineers, open-source contributors, and anyone comfortable working in a terminal environment. What sets Aider apart is its deep Git integration: every change the AI makes is automatically committed with a descriptive message, giving you a clean and auditable history of all AI-assisted edits. Aider supports a wide range of large language models, including GPT-4o, Claude 3.5 Sonnet, and many others via APIs, so users can choose the model that best fits their needs and budget. It can work across multiple files simultaneously, understands the structure of your entire codebase, and handles complex refactoring tasks, bug fixes, and new feature development with impressive accuracy. Whether you are building a new project from scratch or maintaining a large legacy codebase, Aider provides a flexible and highly capable environment for AI-assisted software development that stays out of your way and fits naturally into existing workflows.

Key features

Multi-file editing with full codebase context awareness
Automatic Git commits with descriptive AI-generated messages
Support for multiple LLMs including GPT-4o and Claude 3.5 Sonnet
Natural language code editing directly from the terminal

Pros & cons

PROS

+Completely free and open-source with no subscription required
+Deep Git integration keeps every change tracked and reversible
+Supports many top LLMs giving users flexibility and cost control

CONS

−Requires supplying your own API key which adds per-use costs
−Terminal-only interface may not suit developers who prefer a GUI

Pricing

Free tier

Fully free and open-source. You supply your own LLM API key.

Paid from

API costs vary by model provider (e.g., OpenAI or Anthropic pricing).

Enterprise

No enterprise tier. Self-hosted and open-source for all users.

Who is it for

→Refactoring large codebases across multiple files at once
→Fixing bugs by describing the issue in plain English
→Adding new features to existing projects without switching tools
→Writing and running tests through conversational commands

Frequently asked questions

Is Aider free?

Yes, Aider itself is completely free and open-source. However, you need to provide your own API key from a supported LLM provider such as OpenAI or Anthropic, and those providers charge for API usage based on token consumption.

What is Aider best used for?

Aider excels at multi-file code editing, refactoring, bug fixing, and adding new features to existing codebases. It is best suited for developers who work in the terminal and want AI assistance tightly integrated with their Git workflow.

What are the best alternatives to Aider?

Top alternatives to Aider include GitHub Copilot for in-editor AI suggestions, Cursor for an AI-native code editor experience, Continue for open-source IDE integration, and Claude or ChatGPT for general conversational coding help.

Is Aider safe to use?

Aider is open-source and runs locally on your machine, so your code does not pass through any third-party Aider servers. The main consideration is that your code is sent to whichever LLM API provider you configure, so review that provider's data policies before use.

How much does Aider cost?

Aider the software is free. Your only costs come from the LLM API you connect it to. For example, using GPT-4o through OpenAI or Claude 3.5 Sonnet through Anthropic will incur standard API token charges, which vary based on usage volume.

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