What are some alternatives?
When comparing Simple Calendar and Etar, you can also consider the following products
Google Calendar - Spend less time managing your day & more time enjoying it
Business Calendar - Powerful and easy to use calendar app for Android including weather, widgets and tasks.
Lightning Calendar - Organize your life — it’s about time!
MineTime - MineTime is a free, modern and multi-platform calendar application.
aCalendar - TAPIRapps. aCalendar and aCalendar+ for Android. The fastest Android calendar.
Apple Mail - There’s big news attached.