Tutanota Calendar is a secure calendar with built-in encryption that guarantees that your calendar belongs to you. No unauthorized person can decrypt or read your data.
More Details
Tutanota Calendar is free for personal use for:
One user
1 GB storage
Tutanota domains only
Limited search
One calendar
The Premium plan starts with €1 per month – paid yearly:
Add user (€1)
1 GB storage
1 custom domain
Unlimited search
Multiple calendars
5 alias addresses
Inbox rules
Support via email
Related Tools
Proton Calendar
Proton Calendar is a safe calendar that automatically secures all your events with end-to-end encryption. Events received from people who use other calendars are also secured with zero-knowledge encryption.
1 
