Takes photos ok but unable to move crosshairs. Tried a few times but no luck. Using Samsung Galaxy S7. Contacted the company directly for advice - they didn't even bother replying.
Works well. No problems. Nexus 5x running 7.1.1
The app doesn't work, at least with an LG G5 running Android OS 7.0 (Nougat). You can take the photo, but you can't move the lines around or adjust the line tilt.