There’s none that I’m aware of. And it looks like IONOS will also be aiming for businesses, not users.

Don’t even bother, next thing you know they remove API access and you lost hours of work.

I’ve tried (and failed) 2 times to self host it. I need a hosted service I can rely on, and I need it to be privacy oriented.

How is it superior? Is it approachable for kids around 7yo?

There are a gazillion services like this one, every single one of them claims to have a Linux client.

Every client is an electron based app for debían, if you can’t use that, you’re left (if lucky) with a lousy WebDAV that’s slower than a 90’s AOL dial up connection.

This suite uses Open Exchange, which does not fully support all iCalendar modules.

I’m looking for a interoperable, standards based, fully compliant suite.

Glad I didn’t go with them. Thanks for sharing, next time if you don’t editorialize titles, even better.