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Cake day: April 28th, 2021

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  • If every app on your phone was constantly running and asking the server for new messages, it would drain a lot of battery. That’s why phones instead use a single app that asks a notification server if any new notifications are there. The way it works is if you e.g. get a WhatsApp message, the WhatsApp server tells the notification server that you have a new message, then when the notification app asks that server for new messages, the server will tell it that there’s a new WhatsApp notification. Then the notification app wakes up WhatsApp and tells it there’s a new notification, then WhatsApp checks for new messages and shows you the notification.

    Most apps use Apple’s system (whatever it’s called) on iOS or Google’s Firebase on Android for that. There are also apps that let you use the open standard UnifiedPush, which let’s you use any notification app or server you want.