This disclosure presents a system and a method to generate or control synchronized notifications in co-located devices. The method is implemented via suitable software such as an app. The method assumes that the devices have clocks that are synchronized (at least at a human-perceptual-scale), and are therefore likely on the same network. In this case, the server assigns a date certain to the notification data received and the app simply waits until that time to execute the notification. The method ensures that the notification sounds will all emit at very similar times. A device that experiences network delays would be disregarded by the app and will not be part of the synchronized notification