Hi, Darren.
GS Pro is a DJI free application, valid for iOS at the moment. This first version now is not yet as capable as Litchi app, but has some advantages over it: it is integrated with flight, so you can take off, fly and land without leaving the app. On the other hand, the present capabilities add sufficient new set of missions to plan and save flights prepared previously at home. Camera movements options are not yet as sophisticated as Litchi's, but I believe this is going to change rapidly when new updates of the DJI sofware are released in the future.
It is only valid for iPad. I have just installed it in my iPad mini, but does not show in the iPhone. I have not had time yet to fly it, and I am reading the manual and watching videos and tutorials prior to start using it. I'll report. What is also remarkable is the intuitive and seemingly easy way to input parameters and points via the tactile screen.
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