Proton Calendar: Secure Events

In-app purchases
4,1
4,74K reviews
500K+
Downloads
Content rating
PEGI 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
28 May 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

4,1
4,55K reviews
駿
27 March 2025
Slowly moving over to Proton. The calender app could use a better widget. I'd love to have a widget that shows the month, alongside any tasks/reminders etc that I need to make. But overall it does what it says from my personal experience. Yeah I can't use this as of current, asked for a monthly option for a while now and it's been too long. Will use another calendar app for the time being.
4 people found this review helpful
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Proton AG
28 March 2025
Thank you for taking the time to rate review our app! We've documented your request for a monthly widget + tasks/reminders, to help the team prioritize future improvements for the app.
Skye King
28 March 2025
Paying for the Proton subscription. Calendar works okay, but there's basic functionality missing and it lags badly. example: I'm having trouble remembering my boyfriend's birthday, but there's no calendar search functionality to look it up. Any time I create a new event, the app stalls and I'll have to close out of the app entirely then re-open the app before the new event will appear on my calendar. Frequently entire months fail to load any events and I'll have to close out and restart.
12 people found this review helpful
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Proton AG
01 April 2025
Hello! Thank you for your review and feedback. A search functionality is not yet available, but we'll add your +1 to help the team prioritize this. Try clearing the app's data → Apps → Storage → Proton Calendar→ Clear data/cache (Note: this will log you out). If this behavior persists, report it with the "Report a problem" feature in the app.
CSS 18
16 April 2025
Edit: new updates have cleared ghost "do not exist" events and All Day overspills. Gained 2 stars! Original: All was OK until latest update. Now, All-Day events spill into the next day, and that extra day isn't deletable without deleting the day you want to keep. Also, edits to instances of recurring events now leave the original in place alongside the edits, but those original entries "don't exist" if you try to delete them manually, so the result is very messy and very confusing.
5 people found this review helpful
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Proton AG
25 April 2025
Hello! Sorry about the trouble. Our team is aware of this and is working on a fix. We apologize for the inconvenience. Edit: Thank you for updating your review! If you experience any other issues, please report them through the "Report a problem" feature in the app.

What's new

Minor fixes and improvements.