Aider
Terminal Agent
https://aider.chat/
https://github.com/Aider-AI/aider
Features
Section titled “Features”- the original open-source “AI pair programming in your terminal” — predates most of the agent IDEs in this folder (2023, Paul Gauthier; now the Aider-AI org)
- works directly in a local git repo: reads your codebase, edits files, and auto-commits with AI-generated commit messages so you can diff/revert every AI change like any other commit
- builds a map of your whole repo so it works on large codebases; 100+ languages
- model-agnostic and BYO-API-key (best with Claude / GPT / DeepSeek; local models supported) — no subscription, no agent cloud
- images, URLs, and voice-to-code as context; auto-lint/auto-test hooks that fix what its changes break
- ~48.7k GitHub stars, Apache 2.0, free
Summary
Section titled “Summary”Aider is the quiet veteran of this list: a lean, git-centric, terminal-native agent that does exactly one thing — edit your repo with an LLM and commit sensibly — and has done it well since before “vibe coding” had a name. Where Cursor/Windsurf sell an IDE and Devin/Claude Code sell an autonomous teammate, Aider sells a disciplined workflow: every AI change is a reviewable git commit you can inspect and undo.
It’s the tool to reach for when you want model-agnostic, self-hostable, no-subscribe pair programming inside an existing repo — and the benchmark reference for “did the agent actually improve the code,” since its SWE-Bench history is one of the oldest in the category.
2026.09.08
Section titled “2026.09.08”Status: active (steady, not flashy). aider.chat is live and maintained (last verified Aug 2026), ~48.7k stars, still free/BYO-key. It hasn’t chased the agent-fleet/enterprise wave — it remains the minimalist terminal pair-programmer. Still a solid default for git-centric, model-agnostic local editing in 2026.