WatApp, at least according to the publisher, provides your work and travel itinerary at your fingertips on your phone. We don't speak Bulgarian, the language featured with this app, but bad design is bad design, and we don't think you need an interpreter to recognize it. And WatApp is a victim of bad design and overall bad performance.
The main screen of WatApp contains three large icons: News, WAT about, and My Profile. We tapped the News icon once, twice, three times and nothing happened. A fourth time introduced a news page that was all in Bulgarian, and nowhere did we find any place to customize it to our liking. A tiny gearlike icon resides in the upper-right corner and we thought that maybe it would lead to customization options, but after tapping it multiple times, we pulled up a screen that had two options, both in English: Logout user and Show Images. Next to each was a button that said "Yes." Tapping the WAT about icon took us back to the news page, and the My Profile feature contained fields for a username and password, but not options for creating a profile if you're a new user. The whole app just felt off and we didn't want to give it any more information than we already had.
We're not sure how this app is supposed to help you in your travels, other than to provide a few news items, and for that reason we can't recommend it.