The ABS app is also still in beta on iOS, so unless you are tech savvy enough to either sideload or try to get in on one of the windows when users are booted from the testflight beta, you are going to have to use one of the 3d party apps.
Prologue just seems to do many things nicely, and user experience seems very important to the developer, so there is a huge crowd that swears by the app.