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Aider

The open-source veteran of AI pair programming: chat with AI models in your terminal to edit real code in real git repositories.

Type
Pair programming
Interface
Terminal / CLI
Open source
Yes
Model choice
Any — BYOK
Pricing
Free
Official site
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What is Aider?

Aider has been pairing developers with AI since before 'coding agent' was a buzzword. You chat in natural language; it proposes precise edits, applies them to your git repo, and you review the diff.

It's deliberately git-native — every change is a commit you can inspect, amend, or revert. Combined with bring-your-own-model support, it's a favorite for cost-conscious developers who like control.

Key features

01

Git-native workflow

Changes land as commits you can review and revert.

02

Many models

Works with API keys from major providers; pick per task.

03

Precise editing

Applies surgical edits rather than rewriting whole files.

04

Scriptable

Fits into scripts and automation thanks to its CLI design.

Pros and cons

Pros

  • Free, open source, and battle-tested
  • Git integration makes every change reviewable
  • Cost-efficient with model choice

Cons

  • Chat-driven rather than fully autonomous — you steer more
  • Terminal UI has a learning curve
  • You manage keys and spend

Who is it for?

Developers who want a transparent, git-friendly AI pairing workflow and the freedom to choose (and pay for) their own models.

FAQ

How is Aider different from a fully autonomous agent?
Aider is more collaborative: you chat and steer, it edits precisely. Agents like Claude Code take on longer autonomous runs.
Is Aider free?
Yes, the tool is free and open source; you pay for model API usage.
Does it work with local models?
It supports many providers via API; check the docs for local-model setups.

Try Aider

Pricing and features change fast — check the official site for the latest.

Visit official site →

Last updated: October 2026 · Compare all agents