Been around forever. Hopefully stays that way

Update: still works, still relevant even on iOS 9.3. Has been in my iPhones dock since forever, and migrated from old iPhone to new iPhone. Everything I said below in a review from years ago still applies.

***

Ive been using Prowl since forever. Its indispensable for keeping track of two Macs — one across the room and another 250 miles away. You need Growl but thats easy to set up.
Never had any problems with downtime (that I can remember).

If you want to know what your machines are doing get this App!

Leo of BORG about Prowl: Easy Push Notifications, v1.5.3