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Proton Calendar review

An end-to-end encrypted calendar from Switzerland, built so your schedule stays yours.

Proton Calendar costs from $3.99/mo · 2 plans · prices checked Oct 12, 2026

By Ciroapp Editorial Team · Updated Sep 17, 2026

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Pricing verified Oct 12, 2026

Ciroapp score

3.8/ 5

Proton Calendar encrypts every event detail end-to-end, including on the free tier, and invitations work with people outside Proton. Calendar sharing costs extra, ecosystem features trail mainstream rivals, and the pricing page hides actual prices. Overall, it's a strong privacy-first pick if confidentiality matters more than ecosystem polish.

Pros

Pros:End-to-end encryption covers event contents on every plan, including the free tier — not a paid-only feature
Pros:Swiss incorporation places data under strict Swiss privacy laws and a neutral jurisdiction, a genuine structural difference from US-based Big Tech calendars
Pros:Send and receive invitations works with people outside Proton, so privacy does not come at the cost of coordinating with mainstream users

Cons

Cons:Calendar sharing requires a paid plan (Mail Plus or Proton Unlimited) — it is not available on the free tier
Cons:The free plan caps you at 1 GB of overall Proton storage and a single encrypted email address, which limits how far you can adopt the ecosystem without paying
Cons:Feature depth lags established Big Tech calendars in areas like extensive third-party integrations and ecosystem conveniences, a trade-off of the privacy-first architecture

Best for

Privacy-conscious individuals who want their appointments, health visits, and personal commitments kept out of advertising data pipelines
Existing Proton Mail users who want a calendar that integrates with their encrypted email under the same account
Journalists, lawyers, activists, and consultants whose meeting details carry professional or personal sensitivity

Money-back guarantee: Yes — 30 days

What is Proton Calendar?

Most calendar apps read your appointments, sync them through advertising-linked infrastructure, and treat your schedule as a data source. Proton Calendar takes a different position: it encrypts event details end-to-end so that even Proton's own servers cannot read them. Run by a Swiss company governed by strict Swiss privacy law, it offers a way to plan your days without feeding a data-harvesting business model.

Proton Calendar is a digital calendar application from Proton, the Switzerland-based company behind Proton Mail. It covers the features people expect from a modern calendar: creating events, sending and receiving invitations, and sharing calendars with others on paid plans. The distinguishing element is security architecture — event titles, descriptions, locations, and attendee information are protected with end-to-end encryption, meaning the content of your schedule is encrypted on your device and only decrypted for the people you invite.

Should you choose Proton Calendar?

Quick buyer guidance before you compare plans or click through.

Choose it if

Privacy-conscious individuals who want their appointments, health visits, and personal commitments kept out of advertising data pipelines
Existing Proton Mail users who want a calendar that integrates with their encrypted email under the same account
Journalists, lawyers, activists, and consultants whose meeting details carry professional or personal sensitivity
Families or couples on a paid plan who want to share a household schedule without exposing it to a Big Tech provider
Anyone systematically replacing Big Tech services who needs a calendar that still interoperates with outside contacts via invitations

Skip it if

Users who depend on deep third-party integrations and the broadest ecosystem features of mainstream calendar platforms
People who need calendar sharing but are unwilling to pay — sharing requires Mail Plus or Proton Unlimited
Teams wanting a full collaborative scheduling suite; Proton Calendar is primarily personal and small-scale sharing rather than enterprise resource scheduling
Buyers who only need a calendar and nothing else — the paid tiers are most sensible when the bundled Proton services (VPN, Drive, Pass, Mail) are also useful to you

Next steps before buying

1Create a free Proton account at proton.me/calendar — this gives you Proton Calendar with end-to-end encryption and invitations at no cost, plus 1 GB of storage and one encrypted email address
2Import or manually recreate your key existing events (appointments, recurring commitments) so the calendar becomes usable immediately rather than sitting empty
3Connect the calendar to your Proton Mail inbox so incoming invitations flow directly into your schedule
4If you need to share a calendar with a partner, family, or team, upgrade to Mail Plus or Proton Unlimited and compare the tiers on the checkout page, since prices are not shown on the product page
5Consider the 30-day money-back guarantee on paid plans as a low-risk window to test whether calendar sharing and the wider Proton suite fit your workflow

Proton Calendar Key Features

✨ End-to-End Encryption for All Events

Every event you create — including titles, notes, locations, and participant details — is encrypted on your device before it ever reaches Proton's servers. Decryption keys stay with you and the people you explicitly share with, so the contents of your schedule are not readable by the provider. This applies to the free tier as well as paid plans, making private scheduling the default rather than a premium add-on.

✨ Invitations You Can Send and Receive

Proton Calendar handles meeting invitations in both directions: you can invite others to your events and accept invitations sent from outside the service. Invitees do not need a Proton account to participate, which keeps the tool usable in mixed environments where colleagues or family members use mainstream email and calendar providers.

✨ Calendar Sharing on Paid Plans

Upgrading to Mail Plus or Proton Unlimited unlocks calendar sharing, so you can give family members, partners, or teammates visibility into a shared schedule. Combined with end-to-end encryption, sharing is managed through Proton's cryptographic key model rather than open server-side access — the people you share with can see the calendar, the infrastructure cannot.

✨ Swiss Jurisdiction and Privacy Law

Proton is incorporated and headquartered in Switzerland, placing all user data under Swiss privacy regulations rather than the jurisdictions of large advertising-driven technology companies. Swiss neutrality and the country's strong data protection framework provide a legal backdrop that differs meaningfully from services operated under foreign surveillance or disclosure regimes.

Use Cases

💡 Keeping Sensitive Appointments Confidential

Therapy sessions, medical visits, legal consultations, and job interviews reveal a great deal about a person's life. With Proton Calendar, these entries are encrypted end-to-end, so a schedule that would be readable by a conventional provider's infrastructure stays private. Anyone who is careful about which services hold their personal data will find this the core reason to switch.

💡 Coordinating a Household Without Exposure

Families and couples juggle school pickups, appointments, travel, and social commitments. On a paid plan, calendar sharing lets both partners see and manage a joint schedule inside an encrypted environment. It suits households that already use Proton Mail and want their family logistics kept out of advertising ecosystems.

💡 Journalists, Activists, and Privacy-Conscious Professionals

For people whose meetings carry professional or personal risk — reporters protecting sources, organizers, lawyers, consultants under NDA — a calendar that leaks meeting names and attendees is a real liability. Proton Calendar's encryption model, combined with the company's Swiss jurisdiction and track record, makes it a sensible component of a privacy-focused workflow alongside Proton Mail and Proton VPN.

💡 Migrating Off Big Tech Calendar Services

Users deliberately reducing dependence on advertising-funded platforms often start with search or email and then face the calendar question. Proton Calendar provides a functional replacement that keeps invitations compatible with outside contacts, making the transition practical rather than disruptive — especially for those already migrated to Proton Mail.

Proton Calendar pricing

From$3.99/mo

From the vendor's pricing page, checked Oct 12, 2026
2 plans

Prices checked on Oct 12, 2026 from Proton Calendar's pricing page

View pricing page screenshot

Plan	Billed monthly	Billed annually	Includes
Proton Unlimited	$9.99/mo	—
Mail Plus	$3.99/mo	—

Price history

Tracking prices since Oct 1, 2026. No price change detected yet.

Pricing types: Free plan

Pricing notes

Proton Calendar offers a free tier plus paid plans bundled with Proton Mail and other privacy services. The supplied pricing page does not display the paid prices or billing cadence.

Proton Calendar offers one free tier and two paid bundled plans; the supplied pricing page shows no prices.

Here’s what each tier includes.

Proton Free

Websites Supported: 1 user Best For: People who want a private calendar at no cost Other Features: End-to-end encryption for Calendar, send and receive invitations, 1 GB storage, 1 encrypted email address

Proton Free is a straightforward starting point for personal scheduling. It protects calendar events with end-to-end encryption and supports sending and receiving invitations. It also includes a free Proton account, so it suits anyone who wants to try the service without a paid commitment.

Mail Plus

Websites Supported: 1 user Best For: Individuals who want calendar sharing and expanded Proton Mail features Refund Policy: 30-day money-back guarantee Other Features: End-to-end encryption for Calendar, calendar sharing, send and receive invitations, 15 GB storage, 10 encrypted email addresses, 1 custom email domain

Choose Mail Plus if you need to share calendars with others or want more room for your Proton services. The plan adds calendar sharing to the Calendar features listed for Proton Free. It also expands email storage and adds extra addresses, a custom domain, and priority customer support.

Proton Unlimited

Websites Supported: 1 user Best For: People who want Proton Calendar alongside a broader privacy suite Refund Policy: 30-day money-back guarantee Other Features: End-to-end encryption for Calendar, calendar sharing, send and receive invitations, 500 GB storage, private VPN, encrypted password manager, encrypted cloud storage

Proton Unlimited is the broadest option in the supplied comparison. It keeps the listed Mail Plus Calendar features and adds Proton VPN, Proton Pass, and Proton Drive benefits. It makes the most sense when you also need these bundled services; Calendar alone may not justify choosing the highest tier.

Proton Calendar has a free plan, and the website invites visitors to create a free account. The supplied pricing content does not show paid amounts, renewal prices, annual commitments, or monthly billing details. Paid plans include a 30-day money-back guarantee, while the available page does not state a separate Calendar free trial.

Cost calculator

Estimate what Proton Calendar costs for your team.

PlanSeats (users)

Billing

MonthlyAnnual

Per month: $9.99
Per year: $119.88

Proton Unlimited states no user limit: shown as one price for the whole account. Check the price for 5 users with the vendor. Estimate based on published list prices, before taxes, add-ons and discounts.

How to pay less for Proton Calendar

30-day money-back guarantee if it does not fit.

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Why use Proton Calendar?

Calendars are among the most revealing records a person keeps: medical appointments, job interviews, travel, meetings with lawyers, family arrangements. Conventional calendar services process this data in ways that can support profiling and advertising.

Proton Calendar removes that exposure by design. Choosing it also means consolidating with a provider whose business model is subscriptions rather than data, and whose infrastructure sits under Swiss jurisdiction with a long-standing neutrality framework.

For anyone already using Proton Mail, it slots into the same account with no extra setup.

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Proton Calendar alternatives

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Google Calendar

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Google Calendar is a shareable online calendar designed to keep your plans right at your fingertips. It brings together personal, professional, and organizational schedules in one centralized view. This tool works seamlessly across your Google Workspace to organize tasks and appointments, ensuring your day flows smoothly.

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Cozi

Calendar3.9/5

Cozi is designed specifically as a trusted digital tool for busy families. It solves the headache of coordinating multiple schedules and maintaining household organization. Shared households and parents use it to centralize calendars, appointments, and general logistics. The app pulls together everything you manage—from school events to dentist visits—into a single hub. ✅ You can access your unified family plan conveniently on any mobile device or computer. It has even been named a must-have app by the TODAY show.

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Proton Calendar FAQ

How much does Proton Calendar cost?

Proton Calendar's cheapest paid plan, Mail Plus, costs $3.99 per month. Paid plans range from $3.99 to $9.99 per month. Prices checked on Oct 12, 2026 from the vendor's pricing page.

Does Proton Calendar offer a free trial or a money-back guarantee?

It has a 30-day money-back guarantee.

Has Proton Calendar's price changed recently?

No. We have not detected a price change since we started tracking on Oct 1, 2026.

Is Proton Calendar really free, and what do I get without paying?

Yes. Proton Free includes Proton Calendar with full end-to-end encryption and the ability to send and receive invitations — the core privacy protection is not held back from free users. The free tier also includes one encrypted email address and 1 GB of storage across your Proton account. What you do not get for free is calendar sharing, which requires Mail Plus or Proton Unlimited.

Can I invite someone who doesn't use Proton to an event?

Yes. Proton Calendar supports sending invitations to and receiving invitations from people on any email or calendar provider. Your invitees do not need a Proton account, which makes the service practical in mixed workplaces and families where others use mainstream calendar apps.

What does end-to-end encryption actually protect in my calendar?

It means the contents of your events — titles, descriptions, locations, and attendee information — are encrypted on your device before being stored, and only decrypted for you and the people you share with. Proton's servers cannot read your schedule. This differs from standard calendar services where the provider can access event data on its infrastructure.

Do I need Proton Unlimited to use Proton Calendar?

No. Proton Calendar works on the free Proton plan with encryption and invitations included. Mail Plus adds calendar sharing, and Proton Unlimited keeps that feature while bundling 500 GB of storage, Proton VPN, Proton Pass, and Proton Drive. Choose a paid tier based on whether you need sharing or the wider suite — the calendar itself is usable for free.

Why does it matter that Proton is based in Switzerland?

Proton is incorporated and headquartered in Switzerland, so user data falls under Swiss privacy laws, which are among the strictest in the world, and under a tradition of Swiss neutrality. This gives Proton Calendar a different legal foundation than services operated by companies subject to other jurisdictions' surveillance and data-sharing frameworks.