Proton Calendar: Secure Events

4.3
7.77K 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
Updated on
Jul 7, 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

4.3
7.47K 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. 😩
6 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.
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.
2 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.
Michal K
May 14, 2026
I simply cannot go through sign in process. After credentials,there is captcha and after that verification code that arrives but the screen never loads. Sometimes it shows "Something went wrong" message. App completely unusable due to this bug. EDIT: After setting 2FA via Authenticator and clearing cache/storage as suggested I was able to log in. Thanks for assistance. One thing I really miss out of the box is search capability. Hope it'll be added in next updates.
5 people found this review helpful
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Proton AG
May 22, 2026
Hi Michal. Sorry to hear about that. Are you able to log in via the web app? Can you try re-installing the app, or clearing the app's data from your device's settings → "Apps" → "Proton Calendar" → "Storage" → "Clear local cache/data" to see if that helps? Edit: We're glad to hear that! Your +1 for a search feature has been documented internally.

What’s new

Minor fixes and improvements.