Proton Calendar: Secure Events

In-app purchases
4.1
5.35K 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
Sep 2, 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
5.13K reviews
Tije
January 8, 2023
I really like the theme of this calendar, and I have completely switched to this app for my calendar. I love that you can acces the calendar on a computer! I do have a suggestion for the phone version of the app: Add a feature wherein you can copy an event. Edit: I had a suggestion to be able to set defaults for an event, but it turns out you can already do that in settings -> my calendars. Big downside: App slows down very quickly after having too many events. I can't give it more than 3 stars.
3 people found this review helpful
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Proton AG
January 16, 2023
We are sorry to hear that you experienced slowness in the app. Can you please try going to your device's Settings menu → Apps → Proton Calendar, and clear the local cache and data to see if that helps? If the issue persists, please open a bug report using the in-app "Report a problem" button so our team can investigate.
A.Benjamin Ha
February 17, 2025
First impression is good, not great. I will keep using the app and will update as time goes on. So far, way too basic, the biggest downfall is it's lack of customizability and lack of widgets. There is one widget for daily calendar, it's decent at best. If a calendar app is not easy to use, it will always suffer at the hands of another app that is easier/better to use (See Business Calender 2 Pro, that has a ton of customization and many different widgets, as well as a task list).
13 people found this review helpful
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Proton AG
February 21, 2025
Hello! Thank you for your review and feedback. We'll document your suggestion for the ability to customize the widget on the Proton Calendar app for Android. If you have any additional suggestions, please contact us at https://proton.me/support/contact to let us know. Edit: Thank you for following up - we've documented your feedback internally.
Conor McKenzie
November 22, 2024
Is a good, functional replacement for Google calendar. However, there are a few things I miss from Google Calendar: (1) instant loads; sometimes with proton calendar I have to wait 5-10 seconds to load the calendar and then 10 more seconds to load individual events (2) ability to drag and drop events to change start time (3) no lag; in proton Calendar's week view with over 100 events per week it lags noticeably when changing from one week to the next. Edit: clearing cach does not improve it.
60 people found this review helpful
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Proton AG
November 29, 2024
Hi! Thank you for your feedback - we've shared it with our team. Could you try clearing the app data by navigating to your device's settings → Apps → Storage → Proton Calendar→ Clear data/cache (Note: this will log you out) to see if this helps the slow behavior of the app? Edit: Please report this via the "Report a problem" feature in the app.

What’s new

Minor fixes and improvements.