New 2023
App Store GPX
Topo Maps+  4.6 227 $7,99

Garmin Explore  296

caltopo not listed on app store  Need link from caltopo.com (Apple)
Gaia not listed
Earthmate not listed

Garmin Basecamp

The 7 Best Backcountry GPS Apps alpinsider CALTOPO GAIA GPS

Links:
The 7 Best Backcountry GPS Apps alpinsider
CalTopo - Backcountry Mapping Evolved
Outdoor Guides | Hiking, Camping, Trail Running, Dog Friendly Trails | AllTrails
Earthmate GPS Navigation App | Garmin
Apps:
Topo Map, Hiking Trails, Satellite Map | gaiagps.com
GPS and Map Apps
last updated 1 Dec 2017