I use Drag Queen and it works fine with my Samsung android phone. Keep the phone plugged in during the night as it uses lots of power.

I set the anchor position and distance alarm from my aft owners cabin as I want to be awakened not only if the anchor drags (unlikely) but if there is a significant wind shift during the night that has caused us to swing (more likely).

I now also remember to disconnect my phone's bluetooth connection to the boat's audio system so the entire crew doesn't jump on deck at 3 am when the alarm goes off.