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End-to-end encrypted calendar that keeps your schedule completely private
Swiss-based encrypted calendar with end-to-end privacy protection, zero-access encryption, and cross-device synchronization for secure event management.
Proton Calendar is a secure event management application that prioritizes privacy and data protection through industry-leading encryption. Created by Proton AG, the team responsible for the trusted Proton Mail encrypted email service, the calendar ensures all scheduling information remains visible only to you and trusted participants.
The app delivers comprehensive calendar functionality including recurring events, multiple reminders, timezone support, and cross-device synchronization. All event data undergoes end-to-end encryption before transmission and zero-access encryption on servers, ensuring complete privacy protection regardless of external threats or government requests.
Free with in-app purchases (Premium plans available)
| Feature | Free | Premium |
|---|---|---|
| Encryption Level | End-to-end encryption | Same encryption, more calendars |
| Number of Calendars | Limited calendars | Up to 20 calendars |
| Ad Experience | No ads anywhere | No ads (same privacy) |
| Recurring Events | Basic recurrence | Advanced custom recurrence |
| Task Management | Not available | Full task integration |
| Search Function | Basic search | Advanced search |
| Offline Access | Limited | Full offline access |
Proton Calendar is free with optional premium features through Proton subscription plans. The basic calendar functionality is completely free and encrypted. Premium Proton plans unlock additional calendars, advanced sharing, and integration features.
Yes, Proton Calendar supports importing events from other calendar applications. You can import calendar files or events during setup to transfer your existing schedule without manual entry of each event.
Proton Calendar uses end-to-end encryption meaning even Proton cannot read your events. Google Calendar stores unencrypted events and uses them for advertising targeting. Proton is based in Switzerland with strict privacy protection laws.
Yes, you can invite encrypted shared calendars or share event details with other Proton Calendar users. All shared information remains encrypted and visible only to intended participants, not Proton servers.
Free version offers limited offline access. Premium Proton plans include full offline access to view and edit calendar events without internet, with automatic sync when connection is restored.
Proton Calendar receives regular updates with performance improvements and new features. Recent updates introduced iOS widget support, advanced event scheduling, and video conferencing integration for virtual meeting coordination.
