TRY IT –> https://onesignal.com/
One Signal enables sending push notifications to your website’s visitors through their web browser. Just integrate a notification icon on your website for users to subscribe to and whenever you send an alert, they will see a notification at the bottom right of their browser’s screen.
Retain website visitors by keeping them updated with alerts to get them back onto your website. Whether you have discount pricing or have new content you want to show, users will get an alert on their screen no matter where they are on the internet.
Price – Free!