When comparing Business Calendar 2 vs Etar, the Slant community recommends Etar for most people. In the question“What are the best free calendar apps for Android?” Etar is ranked 2nd while Business Calendar 2 is ranked 12th. The most important reason people chose Etar is:
Etar is a fork of the original AOSP calendar.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Responsive support
Developer provides prompt and understanding support with problems raised/questions asked.
Pro Multiple Calendar + Multiple Task functionality
Allows you to manage multiple calendars and multiple task (Google) accounts with ease.
Pro Multiple flexible widgets
Allows you to customise the look/feel of the widget, even after it has been created. Show different calendar/task accounts per widget.
Pro Advanced scheduling options
Every 2 weeks, then edit four weeks in for 'This and following instances' etc., perfect with Google Calendar.
Pro Open Source
Etar is a fork of the original AOSP calendar.
Pro Material design
Etar adheres to Google's Material design guidelines, i.e. it looks like a "modern Android app".
Cons
Con Trackers!
Con Unskippable Ads
Users are forced to sit through a timer window every day before the ads will skip (for that day). Stupidly poor idea for a "Business" focused calendar app.
Con Isn't multi-platform
No option to manage from PC, it would be cool if there was multi-platform for this app as website, Windows App, Mac OS, etc.
Con Support
Con No apparent way to print the agenda
An essential like printing an agenda should be very easy to do, but it's not.