Proton Calendar: Secure Events

8.57K reviews
Content rating
PEGI 3
1M+
Downloads
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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

8.24K 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. 😩
22 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.
Lino Vázquez Tenorio
April 20, 2026
There is no search function. How did that not make it into the MVP? Sometimes it stays loading for a long time. As if it didn't have any information stored locally. Once it happened during a flight and I couldn’t check my schedule until I landed. It should always, always have a local copy of +/- X months and show it inmediatly. Then try to update in the background. Tell me that what I am seeing might not be the most updated version but don't leave me with an empty screen.
8 people found this review helpful
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Proton AG
April 21, 2026
Thank you for the honest feedback and review. We are working on a rewritten next-gen version of the app, and we'll note your +1 for a search feature along with an offline mode to help the team prioritize future improvements. If you have any other suggestions on what we can do to improve and earn a higher rating, let us know by editing your review.
John Doe
May 3, 2023
Sammy's review said it all so im just going to paste it to show that i would love to see these exact feature as well. know a lot of work is being done and features are still being added, but being able to colour code events without separating them into different calendars would be nice. As would being able to set a task for a day that doesn't require a start and end time, or being set as all day, when neither option quite makes sense, say for example when an assignment is due. This is otherwise
3 people found this review helpful
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Proton AG
May 5, 2023
Thank you for your feedback and review! Please note that we already have plans to add the option to choose event colors as well as manage tasks in Proton Calendar. We will add your vote to these features so our team can better prioritize future improvements to the app.