A:AnswerYes, it works with fortnite quite well. I have iPhone XR and a 2017 iPad. The Nimbus controller works with both. The only issue is on the game side. Once you start a match, you can’t switch from the controller back to touch controls.
A:AnswerI'm not sure if it works with the firebox but I bought Minecraft in the app store and the controller works for the game on my iPhone. So I know it is compatible with the game at least. As long as the device you're playing on is an apple device, it should work no problem.
A:AnswerFortnite has not added controller support to iOS....so no you can not use this controller or any other controller to play Fortnite on iOS...hopefully they change this soon.
A:AnswerThe Nimbus controller works with our Apple iPad Air 2 and iPad Air tablets. It also works with iPhone 7 Plus. The caveat is that the iOS games must support it. For example, Minecraft for iOS works with the Nimbus; but Roblox for iOS does not.