Proton Calendar: Secure Events

In-app purchases
8.22K reviews
Content rating
Everyone
1M+
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
βœ“ Schedule planner syncs automatically across browsers and devices
βœ“ Create recurring events on a daily, weekly, monthly, yearly, or custom basis
βœ“ Use as an appointment scheduler in local or foreign time zones
βœ“ Manage up to 20 calendars (paid feature)
βœ“ View your agenda from the home screen with the Proton Calendar widget
βœ“ Add multiple reminders for any event
βœ“ Use as a daily planner or monthly planner by switching between different views
βœ“ Choose to view your event schedule in dark mode or light mode

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

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

What others say about Proton Calendar
β€œProton 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
Aug 11, 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

7.9K reviews
MJ
June 10, 2026
Update: deleted the account, re-downloaded with all new account info. It happened again! I gave up... Great app, until it signed me out and won't let me sign back in. Everything was working fine for a year and then I had been signed out of my account! Weird. No big deal, but I tried to sign back in numerous times and restarted my phone and cleared the cache and even tried signing into my account on my pc. zero luck. I couldn't recover the account, I tried everything.
9 people found this review helpful
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Proton AG
June 19, 2026
Hello. Sorry to hear about that. Did the logout happen after a system or an app update perhaps? Can you please reach out to us via the support form on our website so we can help you get back into your account? Edit: Have you reported this to us already? If you did, please share your ticket number with us here.
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. 😩
13 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.
Daniel Stank
April 2, 2026
Extremely slow. I really wanted to like it but creating, updating, or deleting events, especially in a series can take 7-30 seconds, which is slower than anything I work with regularly. If its a series there is a wait for the confirmation to only change one instance and then the regular wait for the action after that. So its not like you can just leave and let it take its time. Edit, I followed the steps given and there was no improvement. I plan to cancel.
14 people found this review helpful
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Proton AG
March 20, 2026
That doesn't sound right. Please try clearing the app's data from your device's settings β†’ "Apps" β†’ "Proton Calendar" β†’ "Storage" β†’ "Clear local data/cache" to see if that helps. If the issue persists, submit a bug report via the "Report a problem" feature in the app.

What’s new

Minor fixes and improvements.