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Proton Calendar

Proton Calendar

Your calendar is worth protecting.

#2 dans Calendar
2 min read · Updated 10/4/2025
Proton Calendar homepage screenshot

At a glance

Quick overview for Proton Calendar: rating, pricing summary, key features, and highlights.

Ciroapp review

3.2
Top-tier privacy meets patchy service.

Proton Calendar offers world-class, end-to-end event encryption protected by strict Swiss privacy laws. We respect the focus on security and the free availability of basic tools for all users. Overall, we rate this product highly for privacy, but urge caution due to widespread user reports of poor customer service and slow responsiveness within the larger Proton ecosystem.

Pros

  • Pro:Event details are secured using zero-knowledge, end-to-end encryption.
  • Pro:Protected by strict Swiss privacy regulations and neutrality.
  • Pro:Free version is available, ensuring privacy tools are accessible to everyone.
  • Pro:Seamlessly integrates with the secured Proton Mail service.

Cons

  • Con:Widespread complaints regarding slow and unresponsive customer support.
  • Con:Issues reported with subscription management and refund processing delays.
  • Con:Users report specific performance issues, including sluggishness and slow processing.
  • Con:Lack of support for native Linux desktop clients is cited as a significant drawback.
Free trial
Yes — 14 days
Money-back guarantee
Yes — 30 days
Range: $0.00–$14.99/monthFree plan, Monthly subscription, Yearly subscription
This section is a summary. Detailed sections about features, use cases, pricing, and reviews follow below.
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Proton Calendar review, pricing, features, pros & cons

It can be frustrating when you feel your personal schedule isn't private. Your calendar is a vital record of your life, but many services prioritize advertisers over you. ✅ Proton Calendar solves this problem instantly.

It helps keep your schedule secure and respects your data first.

What is Proton Calendar?

Proton Calendar is designed to keep your personal scheduling private and secure. It offers the full functionality you expect from a modern digital calendar combined with robust protections. Proton is incorporated and based in Switzerland.

This means strict Swiss privacy laws protect all user data, backed by Swiss neutrality. 💡 Proton offers an easy-to-use alternative to Big Tech services, ensuring your data is protected, not exploited.

Proton Calendar Key Features

🛡️ Automatic End-to-End Encryption

Your plans stay completely private because Proton Calendar automatically secures every event. Robust end-to-end encryption is built in, meaning your schedule is private the moment you create it. Only you can access your calendar details; the information is completely scrambled for everyone else.

Even Proton cannot view the contents of your schedule. This strong protection covers your event titles, descriptions, and even the location details you enter. If you decide to invite people, the list of invited guests is also secured.

When you receive invitations from users on other calendar systems, they are protected instantly. Proton uses zero-knowledge encryption to secure these external details. This security ensures that the sensitive information in your invitations remains hidden from third parties.

✨ A Legal Shield from Swiss Law

Proton Calendar offers powerful legal protections for your data. The company is incorporated and headquartered in Switzerland. This location ensures that your most personal information is safeguarded by strict Swiss privacy laws.

Switzerland provides one of the strongest legal frameworks for data protection globally. Your data is safe under these protections, which are further backed by Swiss neutrality. Choosing Proton means benefiting from this strong legal security.

✨ Seamless Proton Mail Integration

You get a powerful workflow advantage when you use Proton Calendar with Proton Mail. This integration lets you manage your scheduling and communications efficiently and securely. You can quickly add new calendar events directly from your secured Proton Mail inbox.

You can also use your Proton Mail email address to securely send event invitations to others. Pairing these services creates a unified environment where your email and scheduling remain private and under your control.

✅ Full Functionality and Efficiency

Proton Calendar delivers the capabilities you expect from a modern digital calendar. It combines this full functionality with robust privacy features to keep your information secure. The tool is designed to help you spend less time managing complex logistics.

You can instantly add new events and set up multiple helpful reminders. The calendar also lets you easily modify invitations when plans change. Having these intuitive tools means you can focus more on the things that truly matter in your day.

✨ Putting People, Not Advertisers, First

Proton offers an easy-to-use alternative to services based on surveillance business models. This calendar respects privacy and ensures your data belongs only to you. Your schedule, meetings, plans, and events stay completely private by design.

With Proton, your data is protected, not exploited for third-party interests. This commitment allows you to maintain control over your personal schedule. It protects your life's record against unwanted tracking.

Use Cases

🛡️ Securing Highly Confidential Appointments

When you schedule important client meetings or sensitive project planning sessions, you need assurance that the details won't reach third parties. Proton Calendar automatically secures all information using end-to-end encryption. This means the event title, the location, and the description are completely private.

Your event details are secured so well that not even we have the ability to view your sensitive data. Furthermore, your schedule is protected by strict Swiss privacy laws. This offers you one of the strongest legal shields available for maintaining confidentiality.

✉️ Streamlining Event Creation via Email

If you use Proton Mail, you can easily turn incoming emails into secured appointments. This removes the hassle of manually copying meeting details and trying to keep track of confirmations.

Here’s how to quickly schedule a meeting:

  1. Receive a meeting request in your secured Proton Mail inbox.
  2. Effortlessly use the integrated feature to convert the email content into a calendar event.
  3. Automatically send secure invitations back to attendees using your Proton Mail address.

🗂️ Organizing a Complex Personal and Professional Life

It's difficult to keep professional projects, family commitments, and personal goals separate when viewing a single calendar. If you utilize a paid plan, you can access up to 25 separate personal calendars. You can dedicate one calendar solely to work, a dedicated one for classes, and another for important family appointments.

This robust functionality lets you organize your schedule with precision, using the tools you expect from a modern calendar. You'll spend less time managing your schedule and more time acting on your plans.

🔐 Protecting Invitations from External Users

You often collaborate with colleagues and friends who might use less secure, mainstream calendar services. When they send you an invite, their original data may not be encrypted. Proton uses special zero-knowledge encryption to secure events received from people on outside systems.

This important protection ensures that critical incoming details—like descriptions and locations—remain hidden and encrypted on your end. Your confidentiality is maintained even when scheduling with parties who don't prioritize privacy.

🆓 Starting Your Privacy Journey Risk-Free

Everyone should have the right to privacy, and testing a new service shouldn't require a financial commitment. The free plan provides robust, encrypted calendar access without needing to pay anything. You get instant access to essential privacy features and our secure infrastructure.

It's a risk-free way to start protecting your schedule immediately and see why millions of users trust Proton.

👥 Securing Small Team or Family Schedules

If you need to share your secure digital environment with one other person, the Proton Duo plan is an ideal choice. It offers massive storage and dedicated features for up to two users. This is perfect for small teams or a family unit focused on digital security.

Both users benefit from encrypted scheduling and shared resources. You get maximum security while easily aligning your important appointments within a trusted ecosystem.

Pricing Overview for Proton Calendar

Pricing range
$0.00–$14.99/month
Pricing types
Free plan, Monthly subscription, Yearly subscription
Money-back guarantee
Yes — 30 days

Proton Calendar is included free with Proton Mail plans and offers flexible options starting at $0.00 per month. Paid plans unlock essential features like sharing and support for up to 25 personal calendars.

Plans & Pricing

Proton Free

Monthly$0.00
Yearly$0.00
Access to 1 personal calendar only.
  • 1 GB shared storage
  • 1 user
  • 1 email address
  • 1 personal calendar
Get Proton Free

Mail Plus

Monthly$4.99
Yearly$3.99
Billed annually at $3.99/month rate. Limited to 1 user.
  • 15 GB shared storage
  • 1 user
  • Support for 1 custom email domain
  • Priority customer support
  • Up to 25 personal calendars
Get Mail Plus

Proton Unlimited

Monthly$12.99
Yearly$9.99
Billed annually at $9.99/month rate. Limited to 1 user.
  • 500 GB shared storage
  • Support for 3 custom email domains
  • Ultra fast and private VPN
  • Encrypted password manager
  • Up to 25 personal calendars
Get Proton Unlimited

Proton Duo

Monthly$19.99
Yearly$14.99
Billed annually at $14.99/month rate. Maximum of 2 users.
  • 1 TB shared storage
  • Up to 2 users
  • Support for 3 custom email domains
  • Dedicated customer support
  • Ultra fast and private VPN

Proton Calendar costs between $0.00 and $14.99 per month with four plans: Proton Free at $0.00, Mail Plus at $3.99, Proton Unlimited at $9.99, and Proton Duo at $14.99 (all annual rates).

Let's explore the advantages each plan offers for protecting your schedule and securing your events.

Proton Free

Price: $0.00/month Websites Supported: Not explicitly stated Best For: Basic, privacy-focused usage Refund Policy: Not applicable Other Features:

  • 1 GB shared storage
  • 1 user
  • 1 email address
  • Access to 1 personal calendar

This is a great starting place for individuals who want robust, encrypted calendar access without paying a penny. You get essential privacy features, though storage and custom calendar limits apply.

Mail Plus

Price: $3.99/month (Billed Annually) Websites Supported: 1 custom email domain Best For: Heavy email users who need more storage and calendar sharing Refund Policy: 30-day money-back guarantee Other Features:

  • 15 GB shared storage
  • 1 user
  • 10 extra email addresses
  • Priority customer support
  • Access to up to 25 personal calendars

You should choose Mail Plus if you need significantly more storage and want to utilize Proton Calendar's full capability, like creating up to 25 separate calendars for organizing your life. It's built for serious individual privacy users.

Proton Unlimited

Price: $9.99/month (Billed Annually) Websites Supported: 3 custom email domains Best For: Power users seeking an all-in-one privacy suite Refund Policy: 30-day money-back guarantee Other Features:

  • 500 GB shared storage
  • Dedicated customer support
  • Ultra fast and private VPN
  • Encrypted password manager and cloud storage
  • Access to up to 25 personal calendars

This recommended plan is perfect for those who want the complete Proton ecosystem. You'll get massive storage and access to all Proton services—including the VPN and password manager—in addition to your encrypted calendar. 🚀

Proton Duo

Price: $14.99/month (Billed Annually) Websites Supported: 3 custom email domains Best For: Teams or couples who need multi-user accounts and maximum storage Refund Policy: 30-day money-back guarantee Other Features:

  • 1 TB shared storage
  • Up to 2 users
  • Dedicated customer support
  • Ultra fast and private VPN
  • Advanced account protection

If you need to share your secure environment with one other person, the Proton Duo plan is the way to go. It offers vast storage and user benefits, making it ideal for a small team or family unit focused on digital security.

Proton Calendar offers a robust Free plan that is always available and never requires a credit card. If you opt for one of the paid annual plans, you're protected by a 30-day money-back guarantee, letting you confidently explore the full suite of encrypted features.

User Reviews

Based on feedback across the Proton ecosystem, users consistently praise the company's commitment to security and privacy. The core products, including Mail and the concept behind Calendar, are often described as 'amazing' or offering 'good value.' Users appreciate the strong privacy ethos and the continuous introduction of new features.

However, enthusiasm is significantly dampened by widespread operational issues. The most criticized aspect is customer service; reviewers frequently describe support as slow, unresponsive, generic, and sometimes 'disgraceful.' Many users report having to resolve issues themselves due to the lack of timely assistance.

Furthermore, there are serious complaints about billing practices, including difficulty getting refunds honored under the money-back guarantee, unexpected account suspensions, and confusing subscription management. While users want to support the privacy mission, they cite performance issues like 'sluggish performance' and lack of specific apps (e.g., Linux desktop clients) as ongoing pain points.

Despite the robust security foundation, the firm’s customer focus needs serious improvement. 🛡️

What users say elsewhere

M. Taylor
· Trustpilot
5.0 / 5

I’ve been a long-time Proton user and deeply value their commitment to security and privacy. The pricing is fair, especially when you consider the full suite of integrated products included. I am excited to continue using Proton Calendar and their other secure services.

Alex E.
· Trustpilot
2.0 / 5

The core product is amazing and offers top-notch security features. Unfortunately, reaching the support team or developers is extremely difficult and often useless. This lack of responsiveness makes it almost impossible to give feedback or get timely help when you need it.

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Why use Proton Calendar?

If privacy is your top priority, choosing Proton Calendar is a simple decision. It’s the world’s largest encrypted calendar service, built around respecting your data and putting people first.

It allows you to spend less time managing your schedule and more time on the things that matter, all while maintaining control.

Here are compelling reasons to choose this secure scheduling solution:

  • ✨ Ironclad Security: Every event is secured automatically using end-to-end encryption. If you receive invites from users on other systems, zero-knowledge encryption secures these details, too.
  • 🛡️ Details Stay Hidden: Not even we can see sensitive event details. This protection covers event titles, locations, descriptions, and the list of people invited.
  • 🇨🇭 Swiss Shield: Proton is protected by strict privacy laws. Your data is safe under one of the world's strongest legal frameworks protecting your most personal information.
  • ✉️ Seamless Mail Integration: Pair Calendar with Proton Mail. You can securely send invites and quickly add new events directly from your secured email inbox.
  • 💰 Available for Everyone: You can protect your schedule at no cost with the free plan. Because everyone has the right to privacy, the basic tools are available to all users.

If you value robust security and functionality combined, Proton Calendar is an excellent choice. It’s trusted by over 50,000 business users and 100 million users worldwide. Start protecting your schedule today! 🚀

Ready to transform your workflow with Proton Calendar?

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Frequently Asked Questions

How many separate calendars can I create using a paid plan?

If you are on the Proton Free plan, you can access one personal calendar. Paid plans, including Mail Plus and Unlimited, significantly expand this ability, letting you create and manage up to 25 personal calendars.

Does Proton Calendar integrate directly with external systems like Google or Outlook?

Not explicitly stated on the official site. The product is designed to integrate seamlessly with Proton Mail for event invites and scheduling. You can connect desktop clients like Outlook, Apple Mail, or Thunderbird through the Proton Mail Bridge, available with paid plans.

How do I move my existing calendar data over to Proton Calendar?

You can use Proton’s Easy Switch tool to migrate your data. This tool quickly transfers emails, calendars, and contacts from your current provider, and the migration happens automatically in the background.

Is the data I import using Easy Switch instantly protected?

Yes. When you use Easy Switch, your existing calendar entries and messages are encrypted the moment they arrive in your new Proton account environment.

Is Proton Calendar sold as a separate service or bundled with other Proton products?

Proton Calendar access is bundled with a Proton Mail subscription. This pricing structure means all plans include calendar access and shared features like overall storage capacity.

Are the paid plans billed per user, or can I share access?

Mail Plus and Proton Unlimited are designed for one user. However, the Proton Duo plan is specifically structured for small groups, supporting up to two users with shared benefits.

Which customer service level do I get with a paid plan?

The Mail Plus plan provides you with Priority customer support. If you choose the higher Proton Unlimited or Duo plans, you receive dedicated customer support.

How does my calendar storage quota work?

The storage included in your plan is shared across the entire ecosystem. This means the capacity you purchase is used collectively by Proton Mail, Proton Calendar, and Proton Drive.

Can I try out the paid features before committing to a full subscription?

Yes. While there isn't a specific free trial for the calendar alone, all paid annual plans are backed by a 30-day money-back guarantee. You can explore the full features risk-free during that period.

What specifically does the encryption protect in my calendar events?

The end-to-end encryption shields sensitive details, including the event title, description, location, and the list of people invited. Not even Proton staff can view this information.

Who is the Proton Unlimited plan best suited for?

The Unlimited plan is recommended for power users needing an all-in-one privacy suite. It includes 500 GB of shared storage and full access to all Proton services, such as the VPN and encrypted password manager.

If I cancel my paid subscription, what happens to my data and access?

Not explicitly stated on the official site regarding data management upon downgrade. The paid plans do offer a 30-day money-back guarantee. You should check the full terms regarding data retention upon cancellation.

Ready to try Proton Calendar? Check out the official site or pricing.
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