Proton Calendar Review (2026): Encrypted Calendar for Private Scheduling across Proton Accounts and Devices

End-to-end encrypted calendar built for privacy-first scheduling

Updated June 19, 2026

By James Han · How we review

3.9 MAQTOOB rating

Our Verdict

Proton Calendar makes the most sense when the calendar itself contains sensitive information and privacy is the reason for changing tools. It fits individuals, families, and small teams already moving into Proton Mail or Proton's wider account bundle.

Test shared calendars, external invites, import/export, appointment scheduling, reminders, mobile behavior, and paid-plan sharing. For advanced Google or Microsoft scheduling, room booking, or deep calendar integrations, compare Google Calendar or Morgen.

A good fit if you

  • Privacy-focused users moving schedules into Proton.
  • Small teams using Proton Mail and encrypted calendar events.
  • Families sharing private events without ad-funded calendar tools.
  • Users who want a free encrypted calendar starting point.

Look elsewhere if you

  • Workspace teams needing mature Google or Microsoft admin scheduling.
  • Users who need many third-party calendar integrations.
  • Companies buying a standalone calendar-only plan.
  • Teams that need public scored reviews for the exact calendar product.
Next step: write down the problem you need solved, check the pricing details, test one real workflow, then compare alternatives before you pay.

What Is Proton Calendar?

Proton Calendar is an encrypted calendar app from Proton for private scheduling across web, mobile, and Proton account workflows.

Official pages emphasize encrypted event details, invitations, reminders, multiple calendars, Proton Mail integration, appointment scheduling, shared calendars, and Proton account plans rather than a Calendar-only subscription.

Proton Calendar Pros and Cons

Pros

  • Privacy-first calendar — Proton encrypts sensitive event details such as title, description, location, and attendees.
  • Proton account fit — Calendar works naturally for users already adopting Proton Mail and Proton account plans.
  • Useful sharing options — Shared calendars and appointment scheduling are available, though advanced sharing should be tested on the chosen plan.

Cons

  • No Calendar-only plan — Pricing is tied to Proton account plans rather than a standalone calendar purchase.
  • Collaboration depth is narrower — Advanced enterprise scheduling and admin workflows are stronger in Google or Microsoft ecosystems.
  • Trial should carry the decision — Users should test sharing, invites, import/export, mobile behavior, and appointment scheduling with their own calendars.

Key Features

Feature What it does Plan fit / purchase note
Encrypted event details Protect event title, description, location, and attendee details where Proton’s security model applies. Fit for privacy-led calendar moves.
Multiple calendars and invites Create separate calendars, manage invitations, reminders, and shared schedules. Test external invites before switching.
Proton Mail integration Use Calendar inside a broader Proton account workflow. Most useful for Proton Mail users.
Appointment scheduling Set up scheduling pages and calendar sharing where plan eligibility allows. Confirm paid-plan requirements.

Who Uses Proton Calendar — and For What

Privacy-focused professionals scheduling sensitive meetings

Use Proton Calendar when event details should avoid ad-funded calendar ecosystems.

Start with free account access.

Proton Mail users consolidating daily tools

Use it when email and calendar should live in the same private suite.

Confirm plan limits.

Families sharing private events

Use shared calendars for simple household coordination.

Test mobile sharing.

Small teams testing encrypted scheduling

Use it for basic shared calendars before moving larger workflows.

Validate invites and export.

Pricing

Plan or option public price Trial / free-plan detail
Free Proton account Official Proton pricing says free accounts include essential Mail, Calendar, Drive, and VPN access. Free plan: yes, free Proton account options verified.
Paid Proton plans Calendar is included in broader Proton account plans rather than sold as a Calendar-only plan. Free trial: no Calendar-only paid trial verified.
Business calendar context Business use should be checked against Proton business plan limits and sharing needs. Confirm users, sharing, and suite requirements.

Source: Official pricing page.

Free plan: yes, Proton's official pricing page says a free Proton account includes essential Proton Calendar access. Free trial: no standalone Calendar-only paid trial was verified. Calendar is bundled into Proton account plans, so users should confirm sharing, appointment scheduling, storage, and business needs against the relevant Proton plan.

Prices checked 2026-06-18 against official product sources.

Integrations

Proton Calendar checks should include Proton Mail, Proton account plan, calendar import/export, shared calendars, link sharing, appointment scheduling, external invitations, reminders, mobile apps, web app, desktop access, encryption model, calendar metadata limitations, and migration from Google or Outlook.

Getting Started: What Implementation Actually Takes

Start with a free Proton account and import one real calendar rather than the whole organization. Test external invites, shared calendars, mobile notifications, appointment scheduling, and export back out. If the workflow works for a week, then compare Proton's paid plans around sharing, storage, domains, and team controls.

Top Proton Calendar Alternatives

  • Choose Google Calendar if Use Google Calendar when Workspace scheduling, Meet, and room booking matter more than encrypted calendar details.
  • Choose Morgen.so if Use Morgen when time blocking and task planning are the bigger problem.
  • Choose GNOME Calendar if Use GNOME Calendar for a native open-source Linux calendar.
  • Choose Sunsama if Use Sunsama when daily planning across tasks and calendar matters more than private calendar hosting.

Frequently Asked Questions

Is Proton Calendar free?

Yes. Proton's official pricing page says free Proton accounts include essential Calendar access.

Does Proton Calendar have standalone pricing?

No standalone Calendar-only paid plan was verified; it is part of Proton account plans.

Does Proton Calendar offer a free trial?

No Calendar-only paid trial was verified.

Who should consider Proton Calendar?

Users who want a privacy-first calendar and are comfortable with Proton's broader suite should consider it.

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