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Aider is a free, open-source (Apache 2.0) terminal tool for AI pair programming that maps your codebase, edits files, auto-commits to git and works with almost any LLM, cloud or local.
Updated Oct 12, 2026
Pricing Free
Rating No reviews yet
Standout Features
Key Features
What is Aider?
Aider lets you pair program with LLMs to start new projects or build on existing codebases.
Aider is a lightweight open-source code generator for terminal-loving developers.
Use Cases
Terminal coding
Refactoring
Test fixing
Working with local models
Workflow
Run python -m pip install aider-install and aider-install.
cd into your project.
Launch aider with a model and API key.
Ask for changes and review commits.
Pros & Cons
Pricing
Aider is free and open source (Apache 2.0). You pay only your LLM provider, or run local models.
Who is it for
Everything you need to know about Aider before you try it.
Add only the files that need changes; too many irrelevant files confuse the LLM and raise costs.
Yes, though it's slower; narrow the scope with --subtree-only or .aiderignore.
Not directly, but /read can add read-only files from another repo.
Real experiences from people who use Aider. Share yours to help others choose the right tool.
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