Powerduck vs Cursor: API Contract Tools for AI Coding

Cursor is an AI code editor that generates happy path tests based on model expectations, but it cannot prove responses conform to an API. In contrast, Powerduck is a local-first OpenAPI studio that provides contract verification, mocks, and typed tool manifests. While Cursor decides what code to write, Powerduck defines the API contract to prevent drift. Many teams utilize both tools to combine efficient code generation with strict API contract honesty and verification.