Proton Calendar: Secure Events

8.81K reviews
Content rating
Rated for 3+
1M+
Downloads
Content rating
Rated for 3+
Learn more
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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
Private calendar: Reminders, schedule planner, calendar widget, time-management
Updated on
Sep 29, 2026

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

8.47K reviews
Eleonora Kowalska
May 5, 2026
Switched from Google Calendar... so far I kinda miss having at least two colour options for events for non paying users, but that's something I can deal with. What's kinda grinding my gears more is the widget. I don't remember the last time it wasn't tweaking (the events just blip, blip, blip in and out) or being stuck in an infinite loading loop. The auto updates are on, it always works for a day and then it breaks again (on Samsung S22). I guess I'll just keep reporting it. 😩
57 people found this review helpful
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Proton AG
May 6, 2026
Hi Eleonora! Thank you for the review and feedback. The team is aware of this issue, and we've noted your report in the internal ticket we've opened for it.
Luke
November 5, 2026
The prompt to update my time zone doesn't mention that it will adjust the starting times of ALL my existing appointments and possibly cause me to show up an hour late. A prompt asking me if I want to update my time zone may as well be in Greek if it doesn't mention the ramifications of my choice. I would like to opt out of the timezone feature alltogether if this is how it is going to work. I am not a person who flies around the world on a regular basis yet your app has no opt out for timezones.
1 person found this review helpful
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Proton AG
November 5, 2026
Hi Luke. Sorry to hear about the trouble. You can turn off the automatic time zone updating in the app's settings → "General" by toggling off the "Ask to update time zone setting" feature. If you need help, or if we've misunderstood your request, let us know by editing your review.
Francessa
October 12, 2026
great app for proton calendar, it automatically syncs your calendar from proton mail invites. the only thing is it has to be connected to wifi or mobile data in order to input an event which is a little annoying when you don't have internet all the time. it would be nice if it allowed for offline access and then it synced when connected to the internet if needed.
1 person found this review helpful
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Proton AG
October 13, 2026
Hi! Offline functionality is planned and we'll add your +1 to help the team prioritize future improvements. Thank you for the review!