Different Owncloud Apps


we are running some Owncloud Servers and use the iOS App.
The app we used until now is the paid Owncloud App (With dark blue background on icon).
Now there are 3 different apps in the store and i would like to know the difference between this apps.
I hope someone can explain it to me.

@tjanzen check my comment Two iOS apps in the iOS App Store?


thank you very much.