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TOOL PROFILE
Proton Calendar
A calendar service with encryption features for event details and an account-based cloud sync model.
Best forPeople who want a calendar integrated with Proton’s privacy-focused account ecosystem.
Plan typeFreemium
Open sourceYes
Research transparency
Product details checked on 2026-10-31.
Proton Calendar is a hosted calendar that offers encryption for stored event details. Calendar invitations are inherently an information exchange: recipients need enough detail to attend, and outside calendar systems may handle invitations differently. Review what is shared and secure the account that protects access.
What it offers
- Encrypted calendar data
- Web and mobile apps
- Sharing and invitations
Limitations
- Invitations to other calendar providers may expose details needed for scheduling.
- Shared calendars make selected information visible to invitees.
- Access depends on your Proton account.
Explore the official provider
Before deciding, review current product documentation, service terms and plan details.
Official websiteFrequently asked questions
Does this tool guarantee anonymity?
No. Every product has limits, and your device, accounts, settings, and the people you communicate with still matter. Review the listed sources before relying on it.
Sources and further reading
Review source dates and policies before acting; external pages may change.
