Wouldn't any 3rd party "app" be useless, according to Apple's rules? I thought all apps had to completely shut down when they are closed. So for it to work, you could set a 3rd party alarm app but not close the program until the alarm time arrives? Meaning you couldn't answer calls, texts, or activate any other app?
I guess the app could create appointments that would then go off to remind you, but it would still be pretty pointless when the built in alarm clock has so many options