Devin

Autonomous AI software engineer that plans, writes and reviews code.

Devin, built by Cognition, is an AI coding agent that works semi-autonomously on software engineering tasks — planning, writing, testing and reviewing code across a codebase (Cognition also folded the former Windsurf editor into this product as "Devin Desktop" in mid-2026). It offers a free tier with a light usage quota, alongside paid Pro/Teams/Max plans for higher usage.

Pricing: freemium