Founded
N/A
Starting Price
Free
Category
AI Coding Assistants
Last updated March 19, 2026
About Aider
Aider is an open-source, terminal-based AI pair programming tool that lets developers collaborate with LLMs to write, edit, and manage code directly in existing projects. It edits files in your local codebase, automatically creates git commits with descriptive messages, and supports over 100 programming languages. With support for virtually any LLM provider — including Claude, GPT-4, Gemini, DeepSeek, and local models via Ollama — Aider gives developers full control over cost and model quality.
Pros & Cons
Pros
- Model-agnostic — use any LLM provider without vendor lock-in
- Zero markup pricing — pay only API costs directly to providers
- Best-in-class Git integration with automatic meaningful commit messages
- Active open-source community with 42K+ GitHub stars
- Codebase mapping enables accurate multi-file edits in large projects
Key Features
Multi-LLM Support
Works with Claude, GPT-4o, DeepSeek, Gemini, local models via Ollama, and virtually any LLM through LiteLLM
Native Git Integration
Automatically commits every change with descriptive messages. Use standard git tools to diff, review, and undo AI changes
Repo-Wide Codebase Mapping
Creates a comprehensive map of your entire codebase, enabling accurate multi-file edits even in large projects
100+ Language Support
Works with Python, JavaScript, TypeScript, Rust, Go, C++, Ruby, PHP, and over 90 more languages
Automatic Linting & Testing
Runs linters and tests on AI-generated code automatically, then fixes any detected problems without manual intervention
Multiple Chat Modes
/architect mode for high-level planning, /ask for questions, /code for direct edits, and in-code AI comments for inline requests
Image & Web Context
Attach images (screenshots, diagrams) and web pages to the chat for visual context and reference documentation
Pricing
Open Source
Free
- Full feature set
- Apache 2.0 license
- Bring your own LLM key
- 100+ language support
- Git auto-commits
Best For
Cost-Optimized Daily Coding
Switch between cheap models (DeepSeek) for simple tasks and premium models (Claude) for complex ones
Multi-File Refactoring
Surgical refactors across multiple files with each change tracked in a reviewable commit log
Privacy-First Development
Use self-hosted models via Ollama without sending code to cloud APIs
Legacy Codebase Modernization
Use repo mapping to help LLMs understand large, unfamiliar codebases and make coordinated changes