Anything "predictive" probably uses Neural Engine. These are iOS features, but a lot of them apply to MacOS too

- Visual Lookup - Animoji - Face ID - recognizing "accidental" palm input while using Apple Pencil - monitoring users' usage habits to optimize device battery life and charging - app recommendations - Siri - curating photos into galleries, selecting "good" photos to show in the photos widget - identifying people's faces in photos - creating "good" photos with input from tiny camera lenses and sensors - portrait mode - language translation - on-device dictation - AR plane detection

Core ML API allows third party developers to use Neural Engine to run models