Principle is a powerful design and prototyping app that allows users to build, test, and share interactive user interfaces quickly and easily. It is the perfect tool for creating high-fidelity, interactive prototypes for websites and mobile apps. It features a robust set of features that help users create powerful user interfaces with ease. The app has drag-and-drop support for elements, customizable animations, and an intuitive timeline for quick iteration. It also has powerful sharing and collaboration features, allowing users to easily collaborate on projects, and share their work with other users. Principle is a great tool for quickly creating, testing, and sharing interactive prototypes.
Adobe XD is for UI Design, Principle is used to perform interaction simulations, where the design is ready. So even its main purpose is not similar!