Safari on iOS supports web push notifications starting from iOS v16.4 (released in 2023). Previous versions did not support web push notifications.
ios
Let’s ask Apple to add Web Push Notifications to iOS
We’ve all been there: you have built a great web app, optimized for mobile, but you have to build a native or hybrid web app just to send push notifications.
Fortunately, thanks to the new standards, like the Push API, Service Workers and Web Notifications, you don’t have to build an app only to have the ability to send push notifications. Now websites can send push notifications directly, even when the user is not surfing the website.
Awesome! The problem is that web push notifications work on Android, but not on iOS!