I’m currently using a Nextcloud instance hosted by a volunteer run non profit. 12€ per account per year, I have one for me and my girlfriend.
However, calendar sharing is limited to people on the users on that Nextcloud instance, which is a bit limiting.
Do you have alternatives that allow federated calendar sharing?
https://calendar.online/ seems promising and is German, has anyone used them before?
Download and create a calendar on: https://anytype.io/
And then you can share it for collaboration. Theres a bit of a learning curve but you can use it for alot more rhan calender and it works very well
Interesting, I see they are based in Switzerland https://anytype.io/faq
The free tier looks nice https://doc.anytype.io/anytype-docs/memberships/monetization