Great app! But how many of these are the same?

This is a great app. But my main complaint is that this developer has so many versions of this app for sale on the App Store and it has confused me since one app says it is not related to the other, but when purchased the content was the same. I also purchased Survival Skills and that app is basically the same as this one. I suspect the army survival for iPad/iPhone is the same as well. So be careful when purchasing from this developer, since you may already have what you are buying.

InfinityFields about Survival Pocket Ref, v3.0