Aider vs Devin
Both are AI code tools. Here’s how they compare on pricing, use case and popularity — so you can pick the right one without opening ten tabs.
Aider
Aider is a free, open-source command-line AI coding tool that connects to your git repo and edits files directly. It works with any AI model (GPT-4o, Claude, etc.) and has strong multi-file editing, test-running and commit support. Popular with developers who prefer terminal workflows.
Devin
Devin by Cognition is a fully autonomous AI software engineer that takes a task description and completes it — writing code, running tests, fixing bugs and deploying — in its own sandboxed environment. The first widely-demonstrated AI agent to complete real software engineering tasks autonomously.
Pick Aider if you want developers who want a free, open-source, terminal-based ai coding assistant. Pick Devin if you want engineering teams who want to delegate complete development tasks to an ai agent. Both have a free way to try them, so the fastest answer is to open each and run your real task.