The best alternatives to 30 Second Sketch are InVision, Sketch Confetti, and SketchAR. If these 3 options don't work for you, we've listed a few more alternatives below.
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SketchAR is an application through which the user sees a virtual image on the surface of which they are planning to trace a sketch.
SketchAR is commonly used as a graffiti creator and a tool for anime drawing, though you can apply the technology for all kinds of painting arts.
Draw, Smile is a drawing app where your face is the interface. Draw a picture then smile as the command to your phone to save the image. It's pretty fun.