Aider is AI pair programming in your terminal

Aider lets you pair program with LLMs, to edit code in your local git repository. Start a new project or work with an existing code base. Aider works best with Claude 3.5 Sonnet, DeepSeek V3, o1 & GPT-4o and can connect to almost any LLM.

Getting started

If you already have python 3.8-3.13 installed, you can get started quickly like this:

python -m pip install aider-install
aider-install

# Change directory into your code base
cd /to/your/project

# Work with Claude 3.5 Sonnet on your code
aider --model sonnet --anthropic-api-key your-key-goes-here

# Work with GPT-4o on your code
aider --model gpt-4o --openai-api-key your-key-goes-here

See the installation instructions and usage documentation for more details.

Features

Run aider with the files you want to edit: aider <file1> <file2> ...
Ask for changes:
- Add new features or test cases.
- Describe a bug.
- Paste in an error message or or GitHub issue URL.
- Refactor code.
- Update docs.
Aider will edit your files to complete your request.
Aider automatically git commits changes with a sensible commit message.
Use aider inside your favorite editor or IDE.
Aider works with most popular languages: python, javascript, typescript, php, html, css, and more…
Aider can edit multiple files at once for complex requests.
Aider uses a map of your entire git repo, which helps it work well in larger codebases.
Edit files in your editor or IDE while chatting with aider, and it will always use the latest version. Pair program with AI.
Add images to the chat (GPT-4o, Claude 3.5 Sonnet, etc).
Add URLs to the chat and aider will read their content.
Code with your voice.
Aider works best with Claude 3.5 Sonnet, DeepSeek V3, o1 & GPT-4o and can connect to almost any LLM.

Top tier performance

Aider has one of the top scores on SWE Bench. SWE Bench is a challenging software engineering benchmark where aider solved real GitHub issues from popular open source projects like django, scikitlearn, matplotlib, etc.

More info

Kind words from users

The best free open source AI coding assistant. – IndyDevDan
The best AI coding assistant so far. – Matthew Berman
Aider … has easily quadrupled my coding productivity. – SOLAR_FIELDS
It’s a cool workflow… Aider’s ergonomics are perfect for me. – qup
It’s really like having your senior developer live right in your Git repo - truly amazing! – rappster
What an amazing tool. It’s incredible. – valyagolev
Aider is such an astounding thing! – cgrothaus
It was WAY faster than I would be getting off the ground and making the first few working versions. – Daniel Feldman
THANK YOU for Aider! It really feels like a glimpse into the future of coding. – derwiki
It’s just amazing. It is freeing me to do things I felt were out my comfort zone before. – Dougie
This project is stellar. – funkytaco
Amazing project, definitely the best AI coding assistant I’ve used. – joshuavial
I absolutely love using Aider … It makes software development feel so much lighter as an experience. – principalideal0
I have been recovering from multiple shoulder surgeries … and have used aider extensively. It has allowed me to continue productivity. – codeninja
I am an aider addict. I’m getting so much more work done, but in less time. – dandandan
After wasting $100 on tokens trying to find something better, I’m back to Aider. It blows everything else out of the water hands down, there’s no competition whatsoever. – SystemSculpt
Aider is amazing, coupled with Sonnet 3.5 it’s quite mind blowing. – Josh Dingus
Hands down, this is the best AI coding assistant tool so far. – IndyDevDan
[Aider] changed my daily coding workflows. It’s mind-blowing how a single Python application can change your life. – maledorak
Best agent for actual dev work in existing codebases. – Nick Dobos