Taking essential steps to improve your digital privacy is pointless if you continue using Google's apps. Using open source alternatives is key to keeping your data secure, as none of your data within the app can be tracked or shared without your knowledge.
Google Calendar is an excellent calendar app. Still, there are plenty of open source alternatives available for Android. If you're willing to sacrifice some functionality, these apps should fulfill most of your calendar needs. If you've just picked up a new Android phone, install one immediately to keep your data secure.
DAVx⁵ is also listed, which does a good job syncing to/from a self-hosted NextCloud server.
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The best open source alternatives to Google Calendar#
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calendarGet organized outside the Google bubble