Apple Sound Recognition

Sound Recognition is a built-in accessibility feature on iPhone, iPad, Mac and Apple Watch that uses on-device machine learning to continuously listen through the microphone for a defined set of sounds and surface an on-screen (and optionally haptic) notification when one is detected. Apple's default sound categories include fire and smoke alarms, sirens, car horns, doorbells and door knocking, running water, appliance beeps (washer/dryer/dishwasher done, dishwasher), shouting, and baby crying, among others, and users can also train the device to recognize a custom sound of their choosing. All detection runs locally on the device rather than sending audio to a server.