I know I can send Prowl notifications from OS X to iOS, but that requires going over the Internet.
I'd like to accomplish the same thing, except that I want to be able to be able to do it without an Internet connection, to be able to send a message from a Mac to (an) iOS device(s) on the same LAN/Wi-Fi network.
(It doesn't have to be with Prowl, it could be with any iOS app, as long as it can receive a message from OS X.)