The app appears to be a conversion from the TripAdvisor website using Microsoft's Project Westminster, but is much more than mere "web wrapper".
Here's a brief description of the app:
"Millions of traveller reviews, photos and maps from TripAdvisor. Book your best trip, every trip. With over 250 million reviews and opinions, from travellers all around the world, TripAdvisor makes it easy to find the lowest airfare, the best hotels, great restaurants and fun things to do, wherever you go. And booking options for hotels, restaurants and flights are just a tap away."
The app may be an example of how Microsoft's "Project Westminster" is supposed to work. Microsoft announced earlier this year it planned to release tools that would allow websites to be ported into universal Windows 10 apps with that code name.
The clues for such a conclusion comes from the popup ad to install the Android app and the nested hamburger menus. Still, the app is fast, responsive and certainly feels native.
Thanks to Ezekiel for the tip!