Aider

Code & Development

Aider AI

FreeOpen Source

About

AI pair programming in your terminal: free and open source, model-agnostic, repo-map codebase understanding, automatic git commits, 100+ languages

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Our Verdict

Recommended

The vim of AI coding: spartan, precise, and completely free

Aider predates the agent hype and still embodies a different philosophy: the AI is your pair programmer, not your replacement. Its repo map squeezes remarkable large-codebase understanding out of modest contexts, and its git-first discipline — every change lands as a clean, undoable commit — is something the flashier tools still haven't matched. It won't run for an hour unattended like an agent, and the terminal UX filters out casual users. But if you want maximum control per dollar (often zero dollars, with local models), Aider remains the sharpest free tool in the drawer.

Best for

•Terminal-native developers who want AI without leaving the shell
•Privacy-sensitive work using fully local models at zero cost
•Engineers who insist on reviewing every change as a git commit

Consider alternatives if

•You want long autonomous coding sessions (→ Claude Code, Cline)
•You prefer a graphical IDE experience (→ Cursor, Windsurf)

Try Aider

Supported Platforms

WindowsmacOSLinux

Available platforms include Windows, macOS, and Linux.

Key Features

AI pair programming directly in your terminal, free and open source

Repo map builds a whole-codebase mental model for the LLM

Automatic git commits with sensible messages — easy to diff and undo

Model-agnostic: Claude, GPT, DeepSeek, Gemini or fully local models

Watch mode: trigger edits from AI comments inside any IDE

Voice-to-code, image and web page context, automatic lint/test fixing

Pricing

free

Completely free and open source (`pip install aider-install`) — you only pay the API costs of whichever model you connect, and local models cost nothing

paid

No paid plans at all — there is nothing to buy; model usage is billed by your chosen provider (e.g. Anthropic, OpenAI, DeepSeek) at their standard API rates

Use Cases

Fast, surgical edits across a large existing codebase from the terminal

Developers who live in tmux/vim and refuse to switch editors

Fully offline AI coding with local models for sensitive code

Git-disciplined workflows where every AI change is a clean commit

Pros

Zero cost beyond model API usage — no subscription, ever

Battle-tested: 44K+ GitHub stars, millions of installs, billions of tokens weekly

Repo map gives strong results on large codebases without huge contexts

Git-native design makes every change reviewable and reversible

Cons

Terminal-first UX has a learning curve for GUI-oriented developers

Less autonomous than agentic tools — it edits, you drive

Python installation and model configuration can trip up beginners

No built-in team, sharing or enterprise management features

Latest Update

2026: Aider surpasses 44K GitHub stars and 6.8 million installs, processing over 15 billion tokens weekly; recent releases strengthen watch-mode IDE integration, local model support and automatic lint/test repair