CleverPush

Installing the CleverPush plugin will automatically insert the CleverPush code into your WordPress site. It will also give you the possibility to create a notification when publishing a new post.
What is CleverPush? 
CleverPush lets you send browser push notifications to your users in the simplest way possible.
AMP Support: 
If you are using the classic / reader mode with a custom theme, please make sure your theme supports the following AMP hooks: 
* amp_post_template_body_open 
* amp_post_template_footer 
* amp_post_template_css
<h3>Configuration</h3>
Enter your CleverPush API keys in the given fields. You can find your API keys in the CleverPush backoffice under Settings > API.

CleverPush lets you send browser push notifications to your users in the simplest way possible.

CleverPush vs PushEngage – Web Push Notifications, WooCommerce Automation & Chat Widget