Proton Calendar review
A privacy-focused calendar with free scheduling tools and limited two-way sync.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Proton Calendar is an encrypted calendar service for individuals, families, and teams that want private event management. It supports event creation, recurring schedules, reminders, invitations, sharing, external calendar subscriptions, appointment booking pages, and automatic Proton Meet links. The service is available on the web, iOS, and Android, with Proton Mail integration for managing invitations and adding events from email. It is a strong fit for privacy-focused users who want scheduling features without paying for a standalone calendar subscription.
The free Proton Free plan covers core calendar management, recurring events, invitations, and calendar import and export. Mail Plus and Proton Unlimited add up to 25 personal calendars, calendar sharing, and appointment scheduling. This makes the product useful across both personal planning and lightweight scheduling workflows, while the plan structure ties the calendar to Proton Mail offerings rather than presenting it as a separate calendar subscription. Buyers choosing between plans should focus on whether shared calendars, booking pages, and multiple personal calendars are required.
Platform coverage includes web, iOS, and Android, with connections to Proton Mail, Proton Meet, Google Calendar, Outlook Calendar, Apple Calendar, and iCal/ICS. Calendar sharing works by link or invitation, and external calendars can be subscribed to through iCal URLs. The main trade-off is flexibility: external synchronization is one-way, and the integration set is narrower than a general-purpose calendar ecosystem. Choose Proton Calendar for encrypted scheduling, free core features, and Proton services; choose another calendar when broad two-way synchronization is central to daily workflows.
Proton Calendar pros and cons
- Where it wins
- End-to-end encryption for calendar events
- Free plan includes recurring events and invitations
- Booking pages, sharing, and Proton Meet links
- Where it doesn't
- External calendar synchronization is one-way
- Narrower integration set than general-purpose calendars
- Calendar is bundled with Proton Mail plans
Proton Calendar fact sheet, pricing and score →
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