Superblock has Pushover Notifications (iTunes Link) for the iPhone, iPod Touch, and iPad in the iTunes App Store for FREE (regularly $4.99) for a limited time.

Pushover is a simple push notification service that integrates easily into web apps like IFTTT, network monitoring systems, shell scripts, and anything else that needs to send alerts to your iPhone, iPad, Desktop, and other mobile devices. App includes a free 5-day trial and unlimited usage beyond the trial requires a one-time in-app purchase.