Proton Calendar: Secure Events

In-app purchases
4.0
4.97K reviews
500K+
Downloads
Content rating
PEGI 3
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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
Jul 7, 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

4.0
4.77K reviews
mark
June 21, 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.
8 people found this review helpful
Did you find this helpful?
Proton AG
July 4, 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. Edit: Thank you for the follow-up. We hope you'll revisit your rating once tasks have been implemented.
Eros
July 24, 2025
The app is pretty good and functional, however something that really is missing is the option to enable the Agenda View when tapping on a day, instead of the timetable view. It will be extremely better for productivity and visual organization. Really looking forward to this feature.
Did you find this helpful?
Proton AG
July 25, 2025
Hi! Thank you for the feedback! We'll pass along your suggestion to the team for future consideration.
Hans
July 13, 2025
Mostly disappointed with the app. Calendar items load and save slowly (multiple seconds), and it does not have 'all the functionality you would expect' (as advertised). For instance, it's not even possible to edit or remove a single instance in a series. Very disappointing.
Did you find this helpful?
Proton AG
July 14, 2025
Could you try clearing the app's cache/data from your device's settings → "Apps" → "Proton Calendar" → "Storage" → "Clear local cache/data" to see if that helps. You should be able to delete a single event from a series of events. Please report this to us via the "Report a problem" feature in the app.