TouchDRO

Great! I built the kit, which was fun. App does everything really well. One suggestion, when calibrating scales, it would be good to be able to see the value as you are homing in on the edge, just so you can be sure you haven't overshot.

Connecting the tablet or the smartphone via usb (all from samsung and all usb-otg capable) immediately crashes the app. Didn't try it via bluetooth yet, but that wouldn't be a good idea anyway. The chance of loosing the connection and ruin your part is too high, made this experience with other bt-devices too often. Would be really great if working reliable with usb, but so far I cannot use it.

Brilliant. Makes accurate milling a real pleasure. The circle function avoids the need for a rotary table. I initially had problems with random resets but that was due to old Arduino code running on my Bluetooth controller. I hope there will be an update to offer even more functionality.