Proton Calendar

Proton Calendar, an encrypted calendar service, is accessible to Proton users through web or mobile applications.

Key Features:

• Automatic end-to-end encryption of all data
• Sharing capabilities with other Proton users
• Import/export options for migrating from other services
• Free-tier users can manage three calendars
• Paid subscribers have access to up to 25 calendars
• Enhanced sharing features exclusively available to paid subscribers

Integration: Works seamlessly with other Proton services like Proton Mail and Proton Drive.