On the home screen, exhibitions are organized (top menu) based on time-frame: Opening, Current, and Ending. But you can also see them as a calendar or map view (bottom menu).
Click on the hamburger menu on the left for detailed information on artists, collections, and news. Here you’ll also find the settings drop-down menu and the about section.
You don’t need to register to use it, but you must create an account to bookmark the exhibitions you want to see.
Download here for iOS and here for Android.