The new OS will feature the same development tools as iOS and OS X: XCode. It also supports Metal, and features Game Center integration.
Apple has already worked with some prominent developers behind the scenes to design some apps specially for tvOS, including Netflix, HBO Now, Hulu, Airbnb, and more. Apple also demoed a new game called “Beats Sports” exclusively for Apple TV. The game will be available on the tvOS App Store on the same day the Apple TV 4 goes on sale. Apple is about to release the iOS 9 GM and WatchOS 2 today. If you want to use the iOS 9 right now on your iPhone then you can do it by registering your iPhone udid to Apple Developer Account, click here to register your iPhone/iPad/iPod/AppleWatch to Apple Developer Account.
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