If you want a WordPress push system working separately from WordPress so we developed our awesome Smart Notification as a stand-alone solution.
Smart Notification WordPress Plugin is a complete notification system for all popular platforms Facebook Messenger, Facebook notifications, Newsletter, iOS, Android, Windows Phone 8, BlackBerry 10, Chrome, Safari, Edge, Opera, Samsung browser and Firefox.
Smart Notification WordPress Plugin Features
tool to detect and create any custom event for WordPress
Send messages to user groups
Integrate with Ultimate Membership Pro
Support localization so you can now download .PO file to translate it into your language
Send push notification messages in a server cron-job or fancy instant sending
Send desktop push notification messages for Chrome/Safari/Firefox
3 different ways to request the push permissions from visitors popup box, icon or native-opt-in window
Delay time for showing the request of push permissions method
Popup box and icon different screen positions
Option to show the request of push permissions for logged and admin users only or special parts of your site
Pay to read to force visitors subscribing in your push notification service to continue reading your contents