Proton Calendar: Secure Events

In-app purchases
4.3
5.22K reviews
500K+
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
✓ 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 28, 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

4.3
5.01K reviews
Ryan Hoelper
July 31, 2025
I've been using Proton for email for 2 months now and I love it, but when I receive a calendar invite and within the Proton email it asks if I want to add this to my Proton Calendar it will open the app for the calendar, display all relevant meeting data, and then I save that...and then nothing. Nothing ever populates on the calendar. This is a constant thing, it literally just does not work as a feature, which is what I depend on my calendar to do so I don't miss important invites.
2 people found this review helpful
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Proton AG
August 1, 2025
Hey Ryan. That doesn't sound right. Could you try clearing the app data from your device's settings → "Apps" → "Proton Calendar" → "Storage" → "Clear local cache/data" to see if that helps? If the issue is persistent, report it via the "Report a problem" feature in the app.
Ron
July 11, 2025
This program is working better for me than anything else I've tried, (I use the agenda view), but one thing that would make it even better is if it could store a local offline copy of my data. When I'm scrolling left/right from day to day I have to wait for my events to load & if I don't currently have a Wi-Fi/cell signal (happens to me a lot at work) then it won't load anything at all. If I need to write down a new event it requires connection to the cloud. Other programs store offline data.
34 people found this review helpful
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Proton AG
July 25, 2025
Hi! We've passed your suggestion along to our team to help prioritize future improvements to our app. Thank you for your 4-star review! Edit: Thank you for updating your review! We'll share your feedback with the team.
Jacob Kral
June 11, 2025
Quite good but the holiday calendar is still very weak and missing most semi major holidays in the USA.. Which is a shame as it's one of the most important functions of a calender. For example Father's day, Mother's day, etc.. Missing. It is possible to add it yourself of course, but on a holiday like father's day (always the 3rd Sunday in June) it's not super user friendly but doable (set it recurring, custom, every 12mo, on X day). Would just be nice to have more by default.
7 people found this review helpful
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Proton AG
July 6, 2023
Thank you for your feedback and review Jacob! The features you've mentioned are already on our roadmap for Proton Calendar and we hope to add them in future updates: https://proton.me/blog/proton-mail-calendar-roadmap. We hope to earn a 5-star review from you in the future.

What’s new

Minor fixes and improvements.