Proton Calendar
Proton Calendar: A privacy-focused calendar with free scheduling tools and limited two-way sync. Ranked #6 of 193 in Calendar Apps by our editors (8.8/10); pricing: Free plan; best for privacy-focused users wanting free scheduling.
At a glance
- Editor score8.8 / 10
- PricingFree plan
- Best forPrivacy-focused users wanting free scheduling
- Free planYes
- Founded2014 · Plan-les-Ouates, Geneva, Switzerland
- Facts checked20 Sep 2026
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
Our verdict on Proton Calendar
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.
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Proton Calendar pricing
All 3 Proton Calendar plans and prices →
Proton Calendar fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Not verified |
| Shared calendars | Yes |
| Time blocking | Not verified |
| Scheduling links | Yes |
| Calendar sync | One_way |
| Mobile apps | Ios and android |
| Video meeting support | Yes |
| Money-back guarantee | 30 days |
| Deployment | Cloud, Desktop, Mobile |
| Platforms | Web, Windows, macOS, Linux, iOS, Android |
| Compliance & security | GDPR |
| Support | Email, Live chat, Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 6 integrations: Proton Mail, Proton Meet, Zoom, Google Calendar, Microsoft Outlook Calendar, Apple Calendar |
| Pricing | Free plan (source) |
| Website | proton.me |
| Facts checked | 20 Sep 2026 |
Proton Calendar integrations
Proton Calendar lists 6 integrations on its own site.
- Proton Mail
- Proton Meet
- Zoom
- Google Calendar
- Microsoft Outlook Calendar
- Apple Calendar
Alternatives to Proton Calendar
- Google CalendarA versatile calendar for personal schedules and Google Workspace collaboration.9.4
- Microsoft OutlookA flexible calendar choice for people and teams already working in Microsoft’s ecosystem.9.2
- Zoho CalendarA low-cost calendar with booking, sync, room reservations, and broad integrations.9.1
See all Proton Calendar alternatives →
Proton Calendar vs the competition
- Proton Calendar vs Google Calendar
- Proton Calendar vs Microsoft Outlook
- Proton Calendar vs Zoho Calendar
- Proton Calendar vs Notion Calendar
- Proton Calendar vs Nextcloud Calendar
- Proton Calendar vs Doodle
Compare Proton Calendar with any tool side by side →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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