What is Aider?
Aider is an open source command-line tool for AI pair programming. You run it in your terminal inside a project folder and connect it to an LLM such as Claude 3.7 Sonnet, DeepSeek, OpenAI o1, o3-mini or GPT-4o, or to a local model. It builds a map of your entire codebase so it can work across larger projects, and it supports more than 100 programming languages.
In practice you ask Aider for changes in plain language, and it edits the files directly. Each change is committed to git with a sensible commit message, so you can review the diff, manage or undo AI edits with familiar git tools. You can also add images and web pages for visual context, use voice to request features or fixes, and have Aider run linters and tests automatically to fix problems it detects. Aider can also be used from within your IDE by adding comments to code, or through a browser chat by copying code back and forth.
Key features
- Works with cloud and local LLMs
- Maps the entire codebase for larger projects
- Automatic git commits with sensible messages
- Runs linting and tests after each change
- Voice-to-code and image or web page context
- Works with 100+ programming languages
Who is it for
- Software developers
- Developers working on existing codebases
- Engineers who prefer terminal workflows
Pros and cons
- Works with most popular LLMs, including local models
- Git integration makes AI changes easy to review and undo
- Najlepsze wyniki wymagają dostępu do API modeli, co generuje koszty
Aider pricing
The vendor does not publish prices in a readable form (often pricing is shown only after signing in).
Is Aider free?
The vendor does not state this clearly on the homepage or pricing page.
Aider alternatives
| Tool | Price from | Free plan | Category |
|---|---|---|---|
 Cursor | 20 USD/mo | yes | Coding |
 OpenAI Codex | 71 PLN/mo | no | Coding |
 Google Antigravity | 30 USD/mo | yes | Coding |
 Kilo Code | 15 USD/mo | yes | Coding |
 Kiro | 20 USD/mo | yes | Coding |
 OpenCode | not listed | yes | Coding |
FAQ
What is Aider used for?
Terminal-based AI pair programming tool that lets developers work with LLMs on new or existing codebases.
Is Aider free?
The vendor does not state this clearly on the homepage or pricing page.
How much does Aider cost?
The vendor does not publish prices publicly or requires sign-in.
What are the best Aider alternatives?
Closest alternatives: Cursor, OpenAI Codex, Google Antigravity, Kilo Code, Kiro.
Data checked October 12, 2026 on the vendor website (aider.chat).