Privacy scenario
Choose Proton Calendar when your priority is privacy and you need proton ecosystem users who want e2e encrypted calendar sync with zero-access architecture..
← Encrypted Calendars 
Proton Calendar
E2E encrypted calendar with zero-access architecture, integrated into the Proton privacy ecosystem.
Proton Calendar is the encrypted calendar component of the Proton ecosystem, built on the same zero-access encryption architecture as Proton Mail. Event titles, descriptions, locations, and participants are encrypted client-side before syncing — Proton cannot read your schedule. It supports multiple calendars, shared calendars (encrypted), and natural-language event creation. Available on web, iOS, and Android. Free tier covers 1 calendar; paid plans (Proton Unlimited) unlock 25 calendars and sharing.
Best for
Proton ecosystem users who want E2E encrypted calendar sync with zero-access architecture.
Use Cases
privacy calendar
Strengths & Limitations
Strengths
- + Zero-access encryption — Proton cannot read your events, titles, or locations
- + Seamless integration with Proton Mail for event invites and notifications
- + Encrypted calendar sharing — share schedules without exposing them to Proton
Limitations
- − Free tier limited to 1 calendar — sharing and multiple calendars require a paid plan
- − Fewer integrations than Google Calendar; no CalDAV for third-party client sync
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Expert Verdict
The only calendar where even the provider can't see your schedule — zero-access encryption done right.
Real-world Scenarios
Calendar scenario
Choose Proton Calendar when your priority is calendar and you need proton ecosystem users who want e2e encrypted calendar sync with zero-access architecture..
When to Choose Proton Calendar
- Best for: Proton ecosystem users who want E2E encrypted calendar sync with zero-access architecture.
- Skill Level: beginner
- Team Size: individual
Product Details
- Deployment
- cloud
- Skill Level
- beginner
Compare in Encrypted Calendars
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