When comparing Prototyping on Paper vs Principle, the Slant community recommends Principle for most people. In the question“What are the best tools for prototyping mobile interactions/animations?” Principle is ranked 13th while Prototyping on Paper is ranked 21st. The most important reason people chose Principle is:
You can find videos for the Principle app course [here](https://www.youtube.com/playlist?list=PLWlUJU11tp4deQOnSFNn_ekpS9GA5_7yP).
Ranked in these QuestionsQuestion Ranking
Pro Multiple device support
Prototyping on Paper supports both Android and iOS.
Pro Based on sketched wireframes
Prototypes made on PoP are based on sketches made on paper or a whiteboard, which are later photographed or scanned and uploaded into the app. Once that's done, hotspots can then be added, which register tapping or several gestures.
Pro Comprehensive help & examples
You can find videos for the Principle app course here.
Pro Simple Sketch import
Import Sketch layers easily to animate your designs.
Pro Build iOS transitions & animations easily
All the iOS easing info is built-in.
Con Not well suited for complex prototypes
PoP is built to be a tool for quick prototyping, especially in participatory design sessions. For complex prototypes with a lot of screens it would require a large number of images to be used and this can make any project hard to maintain.
Con Mac only
Sadly iOS centric.