Cursor is the most battle-hardened AI coding tool on the market — deeply embedded in real developer workflows, beloved for its tab completions and agent mode, and backed by an adoption curve that speaks for itself. Devin, from Cognition, bets bigger: it wants to act as a fully autonomous software engineer that plans, writes, and ships code end to end, with native integrations across project management tools that make it genuinely useful for enterprise handoffs. The meaningful difference is autonomy versus amplification. Cursor makes your developers dramatically faster. Devin tries to replace the developer on bounded tasks — and independent testing shows it succeeds roughly 15% of the time on complex work. That's not a death sentence; it's a fit problem. For repetitive, well-defined tasks with clear specs, Devin can genuinely save hours. For anything nuanced or ambiguous, a human still needs to drive. Choose Cursor if you have a development team and want every person on it operating at a higher ceiling. Choose Devin if you're specifically looking to automate a class of routine engineering work — and you're willing to invest time defining the guardrails. Most businesses should start with Cursor, then evaluate Devin for specific delegation use cases once they've mapped their workflow.