Proton Calendar key facts
Last updated- Legal entity
- Proton AG
- Headquarters
- Switzerland (CH)
- Ownership
- Part of Proton AG
- Data hosting
- Switzerland
- Infrastructure
- Self-hosted (Swiss-based)
- Deployment
- SaaS
- Open source
- No
- US Cloud Act exposure
- Low (no US parent)
- Replaces
- Google Calendar, Microsoft Outlook Calendar, Apple Calendar
About Proton Calendar
Proton Calendar is a privacy-focused scheduling tool that serves as a secure alternative to mainstream calendar services. It automatically encrypts event details, including titles, descriptions, locations, and attendees, ensuring that not even the service provider can access the data. The service is integrated into the broader Proton ecosystem, allowing for seamless event creation from Proton Mail. It is governed by strict Swiss privacy laws and is designed for both individual users (with a free tier) and businesses looking for secure project and team management tools. All data is protected by end-to-end or zero-knowledge encryption depending on the source of the invite.
Alternative to
Target Segments
SMBEnterprise
Deployment Options
SaaS
Hosting & Security
Infrastructure
Self-hosted (Swiss-based)
Key Features
End-to-end encryption for events
Zero-knowledge encryption for external invitations
Send event invitations from Proton Mail account
Add events directly from inbox
Multiple reminders for events
Sharing features (paid plans)
Business/Team calendar versions