Proton Calendar: Secure Events

In-app purchases
4.1
4.85K reviews
500K+
Downloads
Content rating
Everyone
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About this app

Proton Calendar is an easy-to-use planner and a time-management tool that keeps your schedule private

Additional Highlights
✓ Schedule planner syncs automatically across browsers and devices
✓ Create recurring events on a daily, weekly, monthly, yearly, or custom basis
✓ Use as an appointment scheduler in local or foreign time zones
✓ Manage up to 20 calendars (paid feature)
✓ View your agenda from the home screen with the Proton Calendar widget
✓ Add multiple reminders for any event
✓ Use as a daily planner or monthly planner by switching between different views
✓ Choose to view your event schedule in dark mode or light mode

PRIVATE CALENDAR
✓ No ads, no trackers, and no data sharing with any third parties
✓ We can’t spy on your activities or misuse your data
✓ End-to-end encryption — fully encrypted data exchange between Proton Calendar users
✓ Zero-access encryption — event names, descriptions, and participants are encrypted on our servers
✓ Based in Switzerland 🇨🇭 — All your data is protected by strict Swiss privacy laws

USERS FIRST
Building an internet that puts people ahead of profits
✓ Funded by users, not advertisers — privacy is our business model
✓ Built by scientists and engineers who met at CERN and MIT and founded Proton Mail
✓ Used by high-profile journalists and organizations globally
✓ GDPR and HIPAA compliant
✓ Based in Switzerland and protected by some of the world’s strongest privacy laws

What others say about Proton Calendar
“Proton Mail has now made it stupid-easy to encrypt your schedule. Information about what you plan to do, where, and with whom, can be just as sensitive as the messages you send and receive.” Gizmodo
Updated on
16 June 2025

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info, Financial info and 5 others
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

4.1
4.66K reviews
Skye King
28 March 2025
Paying for the Proton subscription. Calendar works okay, but there's basic functionality missing and it lags badly. example: I'm having trouble remembering my boyfriend's birthday, but there's no calendar search functionality to look it up. Any time I create a new event, the app stalls and I'll have to close out of the app entirely then re-open the app before the new event will appear on my calendar. Frequently entire months fail to load any events and I'll have to close out and restart.
15 people found this review helpful
Did you find this helpful?
Proton AG
1 April 2025
Hello! Thank you for your review and feedback. A search functionality is not yet available, but we'll add your +1 to help the team prioritize this. Try clearing the app's data → Apps → Storage → Proton Calendar→ Clear data/cache (Note: this will log you out). If this behavior persists, report it with the "Report a problem" feature in the app.
mark
21 June 2025
Overall a fairly complete and well designed app. The biggest feature I'm missing is the ability to add tasks to the calendar. The biggest problem with the app though is that the it loads/shows the calendar events extremely slow. So slow that it makes the app borderline unusable. Reacting back to proton: Great you're aware of the slownes, though that should really have been fixed by now. Also, tasks were already said to be on the roadmap in 2022. So far I'm underwhelmed.
3 people found this review helpful
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Proton AG
3 June 2025
Hi Mark. Our developers are aware of the slow behavior and are working on a fix. Regarding tasks, they are on our roadmap: https://proton.me/blog/mail-calendar-roadmap-spring-summer-2025. Keep an eye on our social media channels for updates.
Jordan Bartos
31 May 2025
I have the paid version, and I'm happy to support this privacy and security oriented service. However, I am having major issues with the login process. I can login to the website without any issues. On the app, I just get a forever spinning wheel. I suspect it has something to do with 2FA entry screen not getting triggered/loaded properly in the app. I have tried updating to the latest version, clearing cache and user data, updating my phone, and restarting my device. nothing helps.
2 people found this review helpful
Did you find this helpful?
Proton AG
2 June 2025
Hi Jordan! Sorry to hear about the trouble. Since clearing the app data didn't help, try reinstalling the app to see if that makes a difference. If the issue persists, please contact us at https://proton.me/support/contact so we can help.