I bought this app a few years ago in a Christmas sale based on rave reviews. I couldn’t believe how basic the app was once installed. It is (or at least was) just a list of appointments. Not even a day view - just a never-ending “agenda” type view. There’s a row at the top that shows the corresponding calendar days (like a single row of a monthly calendar). As you scroll down the agenda list, the days scroll horizontally to keep the timeline in sync.
That’s basically it. The calender can be expanded to a pseudo month view. It uses the calendar APIs which means when you view or add appointments, it’s literally the exact same UI as the default calendar app (because it’s relying on the calendar app to actually create and save the appointments).
It’s shocking me to that anyone finds it useful. It’s the most basic way that appointment information could possibly be organized.