Designers can use their favorite design tools like Photoshop and Sketch to design the finest details of the user interface for their app. Single or multiple touch interactions can be applied on any UI element (layer) on each screen. Sophisticated animations can be created on-screen as well as screen transitions, using the powerful timeline animation features that Proto.io offers.

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A demo showcasing custom device size, animations and key actions. Use arrow keys to switch between "Play" and "Settings", and X and Z keys to navigate.

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to demonstrate the navigation between the screen and state transitions

Graphics & credit from: https://www.sketchappsources.com/free-source/3362-nyan-cat-vector-sketch-freebie-resource.html. A small basic project animating this small design including its theme song. I do not own any of the following graphical and audio content. All rights are reserved to the appropriate entities.