Principle
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About Principle
Principle is a macOS-native prototyping tool that makes it easy to design animated and interactive user interfaces. It supports creating multi-screen app flows, custom interactions, and timeline-based animations to make designs look and feel polished. Users can import designs from Figma or Sketch, design for mobile, web, and desktop, and share prototypes to the web with one click. The company markets a 14-day free trial and a paid license, with additional features like screen transitions, export options, and a focus on rapid, high-fidelity UI prototyping for design teams.