Demetrius Tautu

This plugin allows your visitors to subscribe to your push notifications as well as receive push notifications whenever you publish a new post.
The process of subscription is 100% automated and your subscribers will be saved within your DigitalPUSH account.
The process of sending notifications on a new post is also 100% automated and it will notify all your previously subscribed users with the following information: 
* Post title ( up to 64 characters ) 
* Post content without any HTML tags ( up to 128 characters ) 
* Post permalink 
* Post featured image ( If the post has no featured image, a standard bell image will be used instead. The same applies if your featured image is http:// instead of https:// )
The subscription is made by implementing the DigitalPUSH javascript library into your pages ( https://cdn.digitalpush.org/lib.js ), library which handles the entire process. 
The push notification sending process is handled by making a POST call from the plugin to the DigitalPUSH API ( https://api.digitalpush.org/push/ ).
To make use of the plugin you will need an account with DigitalPUSH which can be created here: https://digitalpush.org/register.php 
The registration is instant and completely free.
DigitalPUSH is a free to use push notifications service which can be found here: https://digitalpush.org 
DigitalPUSH terms of service: https://digitalpush.org/tos.php 
DigitalPUSH privacy policy: https://digitalpush.org/privacy.php

DigitalPUSH notifications

This plugin allows you to to implement push notifications with your WordPress blog.

pushdytech

<a href="https://www.pushdy.vn" rel="nofollow ugc">Pushdy</a> is an easy way to increase user engagement. Use Pushdy to send visitors targeted push notifications so they keep coming back. It takes just a few minutes to install.
After setup, your visitors opt-in to receive push notifications when you publish a new post. Visitors receive these notifications even after they’ve left your website, thus driving re-engagement.
You can configure notification delivery at preset intervals, create user segments, and customize the opt-in process for visitors.
<h4>Features</h4>
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Supports Chrome (Desktop & Android), Safari (Mac OS X), Microsoft Edge (Desktop & Android), Opera (Desktop & Android) and Firefox (Desktop & Android) on HTTPS sites.
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Automatic Notifications – Send notifications to followers every time you publish a new post. Or set up a reminder that gets automatically sent to them if they haven’t visited for a few days.
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Targeting Segments – Send notifications to specific visitors based on language, number of times they’ve visited your blog, or even set up your own user attributes that you can target.
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Opt-In Customization – Choose when and how to ask your visitors to opt-in to browser notifications. Customize the prompt they first see.
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Real Time Analytics – See your notifications being delivered in real time, and watch them as they convert into visitors.
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A/B Testing – Try out different messages to a smaller set of your visitors to figure out which messages are more effective and then send the more effective message to the rest of your visitors!
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Scheduled Notifications – Schedule notifications to be delivered in the future, based on a user’s time zone, or even based on the same time of day they last visited your website.
</li>
</ul>

Pushdy – Web Push Notifications

Increase engagement and drive more repeat traffic to your WordPress site with desktop push notifications. Now supporting Chrome, Firefox, and Safari.

DigitalPUSH notifications vs Pushdy – Web Push Notifications