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DAViCal

Synchronize DAViCal calendars with your Android device using DAVdroid!

DAViCal is a server for calendar sharing. It is an implementation of the CalDAV protocol which is designed for storing calendaring resources (in iCalendar format) on a remote shared server.

DAVdroid setup

CalDAV/CardDAV path: /caldav.php/user/ (e.g. https://your.server/davical/caldav.php/user/)

Contact group method: groups are separate VCards

Configure well-known URLs so that you don't have to enter the whole path (recommended).