It also has a feature to take photos or snapshots of the model which are saved in a folder Bones3d, in your images folder.
It is a multilingual App, The circular menu above displays options to select from several different international languages. The Color pallet will mark different bones with separate colors. The Semi circular Arrow is the Auto Rotate menu. You need to touch it again to stop rotating. You can slide your fingers to rotate, use the tow finger expanding gesture to enlarge the view and closing fingers gesture to compact the view.
The rightmost icon will take a snapshot of the current view of the model and save it in a folder.
You can also watch a video of this App in action.