So the the situation with apps in Blackberry World could be somewhat messy...
There are native BlackBerry OS apps, Android apps and Android Apps converted to BlackBerry packages.
And there is no information what type of the app the current one is. Or is it? At least browsing Blackberry World did not reveal that info directly...
Let's take for example Skype. There is nowhere information, what type of the app it is. Only looking at the More Description shows: "For more information, visit the Skype for BlackBerry® FAQ page: http://www.skype.com/go/help.faq.blackberry", but that link does not exist and is redirected to https://support.skype.com/en/skype/android/ page and one could assume that Skype for Blackberry is an Android application...