This app requires you to create an account at https://onesignal.com
Browser / OS Compatibility list: https://documentation.onesignal.com/docs/web-push-setup
Thank you for your suggestion Marc :)
Thank you for the kind compliments Lee :)
It works on most Android devices. Feel free to reach us at https://stackideas.com/forums/ should you have other queries. :)
Thank you for the kind compliments Arnaud!