<b>NOTE</b>: Starting with version 6.0 this app is no longer developed and was replaced by https://f-droid.org/packages/com.simplemobiletools.calendar.pro. You are encouraged to uninstall this one and install the new one. To learn more about this change you can read <a href="https://medium.com/@tibbi/some-simple-mobile-tools-apps-are-becoming-paid-d053268f0fb2">here</a>