Vivaldi CalDAV と CardDAV
CalDAV and CardDAV are available via Vivaldi’s webmail .
When you log in with your existing account, you’ll see information that asks you to import your calendar into CalDAV and sync it with your smartphone or other calendar client. I agree with it.
Once the calendar is imported, look for a calendar link to share with your clients.
Add to client using the following details
To sync your calendar , use this URL to connect to your Vivaldi server https://calendar.vivaldi.net/calendars
To sync your contacts , use this URL to connect to your Vivaldi server: https://calendar.vivaldi.net/addressbooks
Then add your credentials from your Vivaldi account ([email protected] + password).