if you go to the app store you can find the app for aquacontroller, you can find the one for reefkeeper, and you are right apple dont make app developper make app and itunes buy them.
And this is what GHL ProfiLux are so proud of they do not make you go to a store to "BUY" something it is supplied for free.
You will find all support for Reef Staus, kindly developed and supplied for free on the support forum, I see you have posted there and one of the many uses will help you out shortly
Lots of apps are free...
So in reality Reef Status isn't really an APP so to speak...
It is a web based App IPhone App. I would really like to port it to an native IPhone App but I do not have the equipment to do so. You need to have a Mac With OSX Leopard or greater And I only have an old MacMini and a couple of windows PCs.