iOS 11 is beta yet but Developers are working on Creative apps.
Bluetooth trackers make a sound when you misplace your wallet, keys or other items. Some of these companies are getting into the AR game with apps which use AR to show you visually where your items are located.
Pixie is one of these, launching an ARKit-based app later this month which uses distance and direction indicators to guide you to your item.
Here is a video of Pixie in action