Yes, web apps can send push notifications to users’ desktop and mobile devices.
There are two ways to send web notifications.
First of all, you can set up your own notification platform. However, setting up your push notification platform takes time and resources.
Second, you can integrate with the existing push platforms. For example you can use Truepush Free of charge with no limit on the number of notification campaigns or the number of subscribers.
You can also set up yours PWA push notification and AMP notification with Truepush.