Aider

Aider is an open-source AI pair programming tool built by Paul Gauthier and released in 2023. The CLI runs alongside any editor, reading the codebase, applying edits, and committing changes to git with descriptive messages on every turn. Aider targets developers who work in terminal-driven environments and want a model-agnostic tool that integrates with existing git workflows rather than replacing the editor.

Key Capabilities:

• Terminal-native CLI written in Python, installable through pip

• Auto-commit to git with descriptive commit messages and optional co-authored-by attribution

• Repo map feature using tree-sitter for codebase-wide architectural context

• Architect mode that separates planning and editing across two different models

• Support for 100+ LLM providers including Anthropic, OpenAI, DeepSeek, Google Gemini, Mistral, and local Ollama models

• /ask mode for code questions without edits, plus /run for sharing shell command output

• Linter and test integration that auto-runs commands and patches detected failures

• Voice input for dictating feature requests, bug fixes, and test cases

• Web chat bridge for using ChatGPT or Claude.ai web interfaces instead of API keys

• Image and web page context for screenshots and reference documentation

• In-code comment triggers for picking up instructions from inline TODO-style markers

• Apache 2.0 licensed with language support spanning Python, JavaScript, Rust, Go, Ruby, C++, and dozens more

See Aider pricing details →