This is an absolutely fabulous app for GIS data collection on a budget. You can't get as fancy with the input forms as you could with an xls.forms based app but it fits the bill for most simple applications and doesn't require an expensive user account.   Just collect the data and export a shapefile or geojson to your Dropbox or Google drive. Exactly what I was looking for for my application in a poor area in West Africa where nobody is going to be able to get an ArcGIS online subscription.   I've been working with GPS for over 2 decades. I've used almost every GPS mapping product out there, and it's clear that the development of this one has come from the perspective of an actual user and not a marketing department.   Very happy.