Kalenderchen

Simple and clear appointment calendar with a focus on privacy and data protection:
- Optional multi-device synchronization with end-to-end encryption (!)
- Own calendar cloud infrastructure on a German server, independent of the big providers
- Calendar also saves the appointments on the device in a separate, isolated database, i.e. other apps cannot access the appointments in the calendar (even if they request access to appointments during installation)
- No personal information required to use a sync account
- Without advertisement
- Synchronization also with the popular calendar version for Windows PCs

Calendar app features details:
- Several calendar accounts can be used (e.g. business, family, club)
- With public holidays for all federal states in Germany, Austria and Switzerland
- Annual appointments with age calculation for birthdays
- Appointments can be organized in categories and shown/hidden respectively
- With a simple to-do list that can be organized into lists: just create a list for your next purchases at the hardware store, or a list for the movies you still want to see, etc.

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More information at https://www.kalenderchen.de