Now Altizure (for iOS) supports Phantom 4 Pro.
Last week, DJI released the SDK 3.5, which added support for Phantom 4 Pro, Inspire 2, and standalone N3.
Altizure generate 2D map, too, although they focus more on 3D.
The advantage is its pricing plan. It's free for about 3 gigapixel (about 250 photos), and the quota can grow if you create good 3D models there.