New requirements for iOS and Android apps in 2018
Starting April 2018, all new iOS apps submitted to the App Store must be built with the iOS 11 SDK, included in Xcode 9 or later. All new apps for iPhone, including universal apps, must support the Super Retina display of iPhone X.
https://developer.apple.com/ios/submit/
Google Play will require that new apps target at least Android 8.0 (API level 26) from August 2018, and that app updates target Android 8.0 from November 2018.
https://developer.android.com/distribute/best-practices/develop/target-sdk
Starting April 2018, all new iOS apps submitted to the App Store must be built with the iOS 11 SDK, included in Xcode 9 or later. All new apps for iPhone, including universal apps, must support the Super Retina display of iPhone X.
https://developer.apple.com/ios/submit/
Google Play will require that new apps target at least Android 8.0 (API level 26) from August 2018, and that app updates target Android 8.0 from November 2018.
https://developer.android.com/distribute/best-practices/develop/target-sdk