Aider

What is Aider?

Aider is an open-source AI pair programming tool that runs entirely in your terminal. You start Aider from the command line inside your git repository, add the files you want to work on to the context, and describe what you want done in natural language. Aider then generates the code changes, shows you a diff, and commits directly to git with an automatically generated commit message — making it feel less like using a chatbot and more like working with a fast, capable colleague who commits their own work.

The open-source nature of Aider is a significant advantage: there are no subscription fees, the code is auditable, and it supports any LLM you can access via API — OpenAI, Anthropic Claude, Google Gemini, local Ollama models, and many others. The tool is actively maintained with frequent releases and a strong community. Aider consistently ranks near the top of the SWE-bench coding benchmark when paired with frontier models, giving it credibility as a serious engineering tool rather than a demo project.

Aider's workflow centers on file context management. You explicitly add files to the context with /add commands, which keeps the LLM focused on the relevant code and reduces token waste. The voice input feature lets you dictate changes, which some developers find useful for describing complex refactors while keeping their hands free. Aider also supports a --watch mode that automatically picks up any AI-readable comments you add to files and implements them — an interesting workflow for developers who prefer to annotate code with intent and let the agent execute.