This Splash screen prototype shows a vector animation of a headphone made in After Effects. Use the Bodymovin plugin that exports a JSON file and can be dropped right into Proto.io.

Imported from Sketch and added a few interactions https://www.sketchappsources.com/free-source/2998-crypto-currency-app-sketch-freebie-resource.html

A Netflix Redesign using Sketch Source: https://www.sketchappsources.com/free-source/2794-netflix-desktop-app-sketch-freebie-resource.html

Simulation of a Key Generator as seen when redeeming keys for various licenses.