Devin

Devin, from Cognition Labs, is marketed as an AI software engineer: you assign it a coding task — a bug fix, a small feature, a dependency upgrade — and it works in its own sandboxed environment with its own shell, code editor, and browser, planning and executing the steps needed, then opening a pull request for a human to review. It integrates with GitHub, Slack, and Linear so it can fit into an existing team's workflow rather than requiring a separate tool. There's no free tier; usage is billed via "ACUs" (Agent Compute Units) starting around $20/mo for a limited allowance, and complex or long-running tasks can consume credits quickly. Devin works best on well-scoped, clearly defined tasks — ambiguous or very large tasks still benefit from human breakdown first, and all output should go through normal code review before merging.