2nd post says that even jailbroken devices will not support it
http://forum.8bitdo.com/thread-406-1-1.html

iOS, Try to buy one with a holder for your phone or tablet.
https://afterpad.com/mficontrollers/

Android controllers won't work with graal. App would just crash, after a few mins.

Here is a list of MFi controller compatible games. You can see all of the GraalOnline games by the G-section
https://afterpad.com/mfigamelist/allgames