Stefan Matei

Applies a lightbox to all image links if and only if the screen is big enough to fit a lightbox. 
Because lightboxes on iPhones should be illegal.

Conditional Lightbox

Use a lightbox only if the screen is big enough.

zedamin

This plugin allows you to send notifications directly from your WordPress site with payload (JSON) to all devices, that have installed your app to notify users about something new.
Now, go to Installation section to find out how to install and use plugin.

Push Notification iOS

This plugin allows you to send Push Notifications directly from your WordPress site to your iOS app.

Conditional Lightbox vs Push Notification iOS