Geocube is a real free geocaching app for the iPhone and iPad: Free of charge and open source. With support for multiple database services, live import and logging and support for the import of GPX files, it is everything a hardcore geocacher needs.
Geocube is a successor of the Geosphere Geocaching app. It supports multiple listing services like Geocaching Australia, Groundspeak geocaching.com and various OpenCaching sites. It supports multiple map providers, import of GPX files, live geocaching (where supported) and live logging (where supported). See the website https://geocube.mavetju.org/ for a list of all features.