Mobile push notifications are sent to users through an application. Therefore, if you want to start sending notifications but your business doesn’t have an app yet, you have to develop one.
Website push notifications, on the other hand, are delivered to users through a browser. You no longer even need to have HTTPS protocol to start delivering push messages to your clients and prospects. Moreover Web Push Notifications are a cost effective substitute to App Push notifications and they are fast and easy to implement and deploy.