Proton Calendar: Secure Events

In-app purchases
4.0
5.76K reviews
500K+
Downloads
Content rating
Rated for 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
Oct 8, 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

3.9
5.53K reviews
A.Benjamin Ha
February 17, 2025
First impression is good, not great. I will keep using the app and will update as time goes on. So far, way too basic, the biggest downfall is it's lack of customizability and lack of widgets. There is one widget for daily calendar, it's decent at best. If a calendar app is not easy to use, it will always suffer at the hands of another app that is easier/better to use (See Business Calender 2 Pro, that has a ton of customization and many different widgets, as well as a task list).
13 people found this review helpful
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Proton AG
February 21, 2025
Hello! Thank you for your review and feedback. We'll document your suggestion for the ability to customize the widget on the Proton Calendar app for Android. If you have any additional suggestions, please contact us at https://proton.me/support/contact to let us know. Edit: Thank you for following up - we've documented your feedback internally.
Andrej Balaz
November 6, 2025
Doesn't integrate well with Proton Drive, Maps, other calendars. Switching from Google Calendar is easy but using the calendar in the same way isn't. Locations aren't resolved so inserting places to meet is a pain. There are no attachments of files, even from Proton Drive. It's possible to subscribe to the calendar and see other calendars reflected in the app, but a true 2-way synch isn't available. Calls cannot be automatically auto-generated. No search. No agenda. Not there yet.
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Proton AG
November 7, 2025
Hi Andrej. Thanks for taking the time to review our app. We'll pass along your feedback to the team to prioritize implementing these features in a future update. If you have any additional suggestions on what we can do to improve and earn a higher rating, feel free to let us know at https://proton.me/support-contact
Erin Keyo Alcock
August 27, 2025
So far, this does not have a monthly view widget, and colour-customizable events. Which makes it pretty much useless. I'm really disappointed, you have every chance to be the app everyone uses but you're missing the most basic features. Edit: Upped to two stars for a fast response to the review. If you can guarantee a good monthly calendar widget with readable colours, and the cost isn't too much, I'd pay for that.
3 people found this review helpful
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Proton AG
September 5, 2025
Hi Erin. A monthly widget is something that has been requested before, and we'll note your +1 to help the team prioritize future improvements. You can assign colors to your events on the paid version of Proton Calendar. Contact us at https://proton.me/support/contact if you have any additional suggestions. Edit. Thanks for updating your review.

What’s new

Minor fixes and improvements.