Seriously?
Absolutely useless. The battery is just a neat way to show the battery level, which you can easily see on the top of the screen. The flashlight is already built into the phone, so why do we need one? And on my iPad the flashlight didn’t work so apparently the flashlight is just a button to turn the flashlight on if you have one. Useless. The mirror is also useless, because we have selfie mode on our phones, I mean unless you wanted the border, and there are plenty of apps with better borders. We already have a magnifier built into our devices, and also the IOS 12 has a measuring app now so really this app has nothing useful that you don’t already have a waste of time, really.