I know there are apps for every thing. My daughters family can see where each other is located at anytime. And we all know about hiker/hunter/fisherman GPS.
But the one that knocks me out is the Bubble Level app. Set your phone on any side against any surface and it shows a bubble and digital readout of the angle.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn