A MadMapper alternative for iPhone and iPad makes sense if you want to map a projector onto a house, a room or a backdrop and don't want to buy desktop software and carry a laptop to do it. MadMapper is excellent professional software, and for big shows it's still the tool. But most people searching for it want to light up one wall, one window or one stage, and for that a phone app does the core job. In the clip beside this article, two separate surfaces are mapped from an iPhone running EasyMapper Studio, with no computer involved.
Here's an honest comparison: what each one costs, what each one does, and when to pick which.