Hi, I released an app to make voxel art, it's straighforward and easy to use, just tap to create voxels, pinch (zoom), drag to rotate. You can even export your models to SketchFab. Download free: https://itunes.apple.com/us/app/voxel-draw/id1084634617?mt=8
Make voxel art with Voxel Draw for iOS Voxel Draw is an app to easily create voxel art (3d pixels) on your mobile devices. Just tap to create a voxel, rotate the camera with swipe and zoom in or out with pinch.