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Aider

Paul Gauthier's terminal-native open coding agent; BYOK; git-aware diffs; widely loved for its directness.

Apache 2.0 · stable · Project site → · GitHub →

Aider is a terminal-native open coding agent built by Paul Gauthier. Apache 2.0. Architectural choices that make it distinctive: BYOK on the model (any OpenAI / Anthropic / OpenRouter / local provider), git-aware (every edit becomes a proper git commit, so the user always has an undo), no sandbox (runs against your real working tree by design), and a deliberately small surface area (do one thing well: edit code based on conversation). Aider matters because it is the most-loved minimal open coding agent. The design philosophy is "smallest sharp tool that works"; the project consistently lands near the top of community SWE-bench-style leaderboards despite shipping less machinery than the bigger frameworks. Compared to siblings: OpenHands (more elaborate, sandboxed, more feature surface), Goose (extension-based, broader scope than just coding), Cline / Continue (IDE-integrated). Aider's distinctive angle is the terminal-first, git-as-undo, do-one-thing-well stance. Production-ready and widely used by developers who prefer the terminal over an IDE, by anyone wanting a model-agnostic coding agent without a hosted service in the loop, and by users on Mac / Linux who want something that works against local models via Ollama. The community is active, the maintainer is responsive, and the project's small surface keeps it healthy to maintain. A frequent recommendation when "what should I use as a starting point for AI-assisted coding" comes up.

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