When comparing Business Calendar vs CalendarZ, the Slant community recommends Business Calendar for most people. In the question“What are the best calendar apps for Android?” Business Calendar is ranked 6th while CalendarZ is ranked 10th. The most important reason people chose Business Calendar is:
Business Calendar offers configurable widgets in many sizes for displaying Days, Weeks, Months or Agenda views on a user's home screen.
Specs
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Pros
Pro Widget support
Business Calendar offers configurable widgets in many sizes for displaying Days, Weeks, Months or Agenda views on a user's home screen.
Pro Free ad supported version available
Business Calendar comes in a free ad supported version.
Pro Smooth zoomable user interface
Business Calendar has a user interface that supports scrolling and pinch zooming.
Pro Search function
Business Calendar has a search function that allows searching the calendar for dates and events.
Pro Integrates with Google Maps
Users who input locations can use Google Maps from an event to find the directions and location.

Pro Move Calendar events from one Calendar to another
The only app that has the ability to move an event to a different calendar if it was accidentally created in the wrong calendar. This app is an essential addition to any device and for anyone with multiple calendar accounts.
Pro Events can be created using the share menu
Pro Can manipulate with multiple events at a time
The app allows selecting multiple events and move or delete them together.
Pro Dark theme supported
From 1.7.2.3 version, a new black theme was added. It looks so cool! Specially when you get tired after work but need to check your schedule.
Pro Show Facebook events
This app can show your Facebook events such as upcoming friends' birthdays or ordinary events.
Pro Integrated weather app
CalendarZ can show up to 10 days of weather forecasts. You can change the location in the settings menu.
Pro Widgets for changing appearance
CalendarZ has two widgets which can change the background color, opacity, etc. Check this at:
https://plus.google.com/104122196952508269918
Pro Convenient scheduling feature
You can schedule an event to repeat on the last day or the third Friday of the month.
Pro The design looks great and easy to use with navigation menu
Pro Very nice UI, UX design
The app interfaces use material design and the widgets provide month, agenda, week view for many kind of user experience.
Pro Actively maintained with regular updates
Pro The feature of repeating event
This app can give you excellent and vary options.
Cons
Con Poor visual design
The design of the app looks a bit dated, something out of the early 2000's. While this does not impede the usefulness of the application, it still is a sore point when compared to some of the other popular calendar apps available on Android.
Con Widgets don't show week numbers correctly on some devices
Widgets on certain devices have been showing week number incorrectly for more than 2 years. The issue hasn't been addressed and there is no sign that it will be.
Examples from S4:
Con Poor support
The developers provide virtually no help with issues.
