aider
aider is AI pair programming in your terminal
The Lens
By Erik Loyd, SaaS CEO and former COO/CFO of an AWS Premier Partner.
Updated Oct 2026
Aider is an AI pair programmer that lives in your terminal. Run it inside a git repo, say what to change, and it edits your files and commits each change with a sensible message, so every AI edit is one /undo away. It maps your whole codebase, works with almost any model including local ones, and it's free under Apache 2.0.
Install with python -m pip install aider-install then aider-install; it pulls in its own Python 3.12 if needed. Bring your own API key and pay the provider. No account, no server, no paid tier, and analytics are opt-in. Solo devs and small teams: free, and a great fit if you already live in the terminal. Larger teams: fine per developer, but there's no admin console, so you govern keys and spend at the provider.
The catch is maintenance. The last release shipped in February 2026 and the last commit in May, with a big open backlog. Newer Claude and GPT support sits on main, unreleased. It's also a pair programmer, not a hands-off agent: you pick the files. For that, look at Claude Code, Codex CLI or OpenCode. The community fork cecli is still shipping.
Free vs Self-Hosted vs Paid
fully freeFree: Everything. Apache 2.0, no account, no paid tier, no gated features. Analytics are opt-in and anonymous and, per the docs, never include your code, chat messages or keys.
Self-hosted: It runs on your machine, nothing to host. Install with python -m pip install aider-install then aider-install (it installs a separate Python 3.12 if needed), or the uv / curl one-liners from the install docs. It connects to almost any LLM, including local models, which removes the API bill entirely if your hardware can carry a usable model.
Paid: There is no paid tier. The real cost is the model API you plug in (Anthropic, OpenAI, DeepSeek, OpenRouter and others), billed by that provider per token.
Aider itself is free with no paid tier. The only bill is the model API you plug in, or nothing if you run a local model.
What to do by team size
- Solo
- free; bring your own API key
- Small team
- free; each dev runs it with their own key or a shared provider account
- Medium team
- free, but there is no admin or usage control, so manage keys and spend at the provider
- Large team
- free, though slowed maintenance and no governance features make Claude Code, Codex or Copilot easier to roll out
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