#7 in Coding & IDE agentsOpen source

Aider

Open-source pair programmer in the terminal.

Aider is an open-source terminal tool that edits a git repo with a model you choose. You bring an API key or a local model. There is no Aider seat fee.

Official site

Why this rank

For terminal-first work, Aider is the small, git-native option with no vendor seat between you and the model.

Best for

Terminal edits when you already pay an API.

Pricing

Free and open source. You pay the model provider, or you run a local model. Aider does not sell a hosted coding seat.

Pricing checked November 7, 2026. Confirm it on the official site.

Before you commit

There is no hosted cloud agent and no included model quota.
You manage git, keys, and the environment yourself.

Also look at

Cline — Open-source coding agent that asks before it acts.
Claude Code — Anthropic's coding agent in the terminal, IDE, desktop, and browser.
OpenAI Codex — OpenAI's coding agent across the CLI, IDE, web, and cloud.