Any alternatives to the native IOS Calendar

Any alternatives to the native IOS Calendar ? the native Calendar seems terrible compared to Google Calendar. For example if I move the phone from vertical to horizontal the Calendar does not respond to that change. I have also tried to link my Outlook.com Calendar to my iphone and alot of events aren't showing even when I select all the "Outlook Calendars" under the native Calendar app.

What is even more fustrating is I can see the events on the Calendar app on my Mac?

The reason I moved away from Google was privacy but at least Google Calendar works..