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Open-source coding agent
★ 36.1k starsApache-2.0
View guide →Aider is AI pair programming in your terminal
Aider is an open-source dev tools project by Aider-AI (Aider-AI/aider on GitHub). It has 49,352 GitHub stars and 5,024 forks, is released under the Apache-2.0 license, and was last updated on GitHub on 22 May 2026.
Editor extensions, terminal commands, or standalone apps — most install in under a minute.
Use a hosted frontier API, or keep everything local with an open model backend.
The tool indexes your codebase so suggestions and edits are project-aware.
Ask for features, let it edit files, run tests, and review diffs before you accept.
Not just autocomplete — plans, edits multiple files, and runs commands.
Indexes your repo so answers respect your actual code, not guesses.
Lives where you work: VS Code, JetBrains, Neovim, or the plain terminal.
Swap between frontier APIs and local models per task.
Every change is a reviewable diff — you stay in control.
Customize prompts, tools, and behavior; no black box.
Download the source and move into the project folder.
git clone https://github.com/Aider-AI/aider.git
cd aiderIsolate dependencies so nothing clashes with your other projects.
python -m venv .venv
source .venv/bin/activate # Windows: .venv\Scripts\activateInstall the requirements, then follow the README's launch command (it varies per project).
pip install -r requirements.txtIt multiplies them — the best results come from developers directing, reviewing, and owning the design.
Cloud frontier models code best today; local models keep everything private and free.
It is an open-source project at Aider-AI/aider with 5,024 forks. Check the repo's contributors and recent commits to see how active maintenance is.
With local models, no. With APIs, check the provider — many offer zero-retention modes.
Coverage varies: VS Code and terminal are universal; check each tool for JetBrains/Neovim.
The tools are open-source; model usage may cost if you use paid APIs.
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