When comparing Prototyping on Paper vs Pencil Project, the Slant community recommends Pencil Project for most people. In the question“What are the best tools for prototyping mobile interactions/animations?” Pencil Project is ranked 8th while Prototyping on Paper is ranked 20th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
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 Inter-page linking
Pro Pencil Project as a Firefox extension
Pro Export to SVG and PDF
Pro GUI prototyping
Can be used for GUI (Graphical User Interface) prototyping.
Cons
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.