What are some alternatives?
When comparing Mobile Sketchpad and SketchAR, you can also consider the following products
Whimsical Wireframes - Lightning fast wireframing with real-time collaboration.
Apple ARKit - A framework to create Augmented Reality experiences for iOS
Method Wireframe Kit - Find your method of being incredibly fast in prototyping.
Made With ARKit - Hand-picked curation of the coolest stuff made with ARKit
Source Wireframe Kit - Library of 537 blocks for desktop and mobile prototyping
AirMeasure - Turn your phone into a ruler with the power of AR