You can connect any calendar with a CalDAV address, with an app password if the service has one, and otherwise your password.
| Service | What you need |
|---|---|
| Yahoo | An app password. Yahoo requires a browser in which you have been signed in for a few days. |
| Fastmail | An app password with access to calendars. A password for mail only does not work. |
| Another service | The CalDAV address, your username and your password. Ask your service for the address if needed. |
The address must start with https and be reachable from the internet. With Test connection you immediately see which calendars we find.
Good to know
You can see attendees and your answer to an invitation here, but you change them in your own calendar app. Some services send attendees a message themselves when something changes; that is why we ask first.