When comparing Prototyping on Paper vs Animation Desk, the Slant community recommends Animation Desk for most people. In the question“What are the best tools for prototyping mobile interactions/animations?” Animation Desk is ranked 19th while Prototyping on Paper is ranked 20th. The most important reason people chose Animation Desk is:
Great for light sketches, and some drafting for your animation.
Specs
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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 Quick sketch
Great for light sketches, and some drafting for your animation.
Pro Free to use
Some features may require purchases but the app free as is, and works fine.
Pro Works on different platforms
It supports almost every major platforms, so working on iOS, Android, and Windows devices is not a problem.
Pro Photoshop compatible
Supports PSD file import/export, can export your draft to Photoshop easily for further works.
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.
Con Android version is not as extensive as the iOS version
Some of the options that are present in the iOS version of Animation Desk Cloud aren't integrated in the Android application. For example, features such frame labeling isn't available.