ARKit lets you seamlessly blend realistic virtual objects with the real world, so you can take your apps beyond the screen. Use these resources to learn how to clearly indicate when the user enters AR, show users what to expect from your AR experiences with app previews, and build Face Tracking support for iPhone X.

Interface Design
Provide an intuitive initialization process within your app to clearly indicate when the user enters AR.
Read the Human Interface Guidelines.

App Previews
Create short videos of your AR app experience for your App Store product page. Since app previews autoplay on the App Store on iOS 11, they’re key in helping users discover and learn about your app.
Read Creating App Previews for AR Apps.

Face Tracking
Learn how to detect the position, topology, and expression of a user’s face, use facial expressions to drive a 3D character, and more with the TrueDepth camera on iPhone X.
Watch Face Tracking with ARKit.