Proton Calendar: Secure Events 4+

Keep your schedule private

Proton AG

    • 3.5 • 403 Ratings
    • Free
    • Offers In-App Purchases

iPhone Screenshots


A calendar is a record of your life: Proton Calendar helps keep it private.

Make the most of your time
- See your upcoming events as you like with agenda or day view
- View and reply to invites
- Events and invites are automatically added to your calendar from your Proton Mail inbox
- View your schedule in light or dark mode
- Add multiple reminders for your events
- Create recurring events on a daily, weekly, monthly, yearly, or custom basis
- Keep your calendar in sync across all your devices

Private by default
- No ads, no trackers, and no data harvesting
- We can’t spy on your calendar or misuse your data
- Protected by the same end-to-end encryption used in Proton Mail
- Event names, descriptions, and participants are stored with zero-access encryption
- Based in Switzerland, all your data is protected by strict Swiss privacy laws

People before 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

What others say about Proton:
“Proton 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

Follow Proton on social media for all the latest news and offers:
Facebook: /proton
Twitter: @protonprivacy
Reddit: /protonmail
Instagram: /protonprivacy


What’s New

Version 2.7.0

New in this version:
- Month view

Fixed in this version:
- Incorrect date inside a notification, after DST change

Ratings and Reviews

3.5 out of 5
403 Ratings

403 Ratings

JavidDoe101 ,

One major problem

I’m new to proton. I just signed up and am starting to migrate my email to proton. I am trying to use the calendar but I’ve run into an issue. If I receive calendar invites in my email that are an attachment (such as an ICS file), there doesn’t seem to be any way to add them to my calendar. From the proton mail app there is no “add to calendar “ button. From the calendar app there is no import that I can find which allows you to import a downloaded file, and in iOS when you try to use the “share” button the calendar is not an option. This means the only way I can find to add some invites to my calendar is to manually enter the information. Ideally an “add to calendar” button should be available from the mail app, and a share extension should be available so you can receive a file/invite into your calendar.

On the plus side: My wife and I are both migrating to proton, so it’s nice to be able to share the calendar with her and both of us to see the same events. I’m still new so as I use this more I can get a better opinion.

Developer Response ,

Hi! Thank you for your honest feedback. Unfortunately, at the moment, it is not possible to accept/decline calendar invites through the Proton Mail iOS app. Currently, in order to accept or decline calendar invites on an iOS device, you need to access Proton Mail through a web browser at and open the invitation from there.

This option has been requested already and we have added your vote to it as well.

HaVoK-O7 ,


Performs the basics with reminders, good visualization, location, and making it recurring. Missing the ability to share a calendar currently, which is currently being worked on. This is a core function of a calendar though, and should integrate better with their email services, even if these functions are restricted to other working Proton users. I hate to rate something down for a service it openly declares is not currently implemented, this is pretty central to a calendar app and is currently keeping me from fully migrating to Proton Calendar. The app also needs additional security found on Proton Mail and Proton Drive where it allows for the use of a password/pin and/or biometric on startup. Looking forward to the updates, and of course I will update my review when things change.

edit: Thank you for the reply! I did not see sharing was an option since I primarily use the app on iOS. I will try it out from the PC see if I can share and then still update and use it from iOS. Not ideal, but at least a work around.

Developer Response ,

Thank you for your feedback and review! Auto lock for the app as well as the option to edit shared calendars are features we hope to add to the app in the future.

Note that sharing calendars collaboratively between Proton users is already possible in the Proton Calendar web client and Android app:

busydonthavetime ,

Been using a few months

I’ve been using proton for about a month and weaning myself off Google. So for the time being I’m trying hard to overlook many of the lack of convenience items that come with going with a non big dawg in the calendar space. In general the app does what I need it to do and it’s encrypted so that’s why I’m continuing to use it. Here are the three big features that are missing:

1) I cannot add events from proton mail into proton calendar. This is super annoying and sometimes I go to my laptop just so do this in bulk before I delete emails, or I manually add it on my phone.

2) I cannot add participants in the app. Similarly now I often have to go sit down at my computer to add participants to an event.

3) this is more nitpicky but I find it cumbersome to have to scroll through 60min when setting a time for an event. Almost all of my events are at x:00 or x:30, occasionally at x:15 or x:45. It is actually too much to have to swipe multiple time to change a start time from x:00 to x:30. If a user needs to set it to something weird like x:37 they can type it and the scroll wheel should just have round numbers in it.

Otherwise the value prop of encryption, in addition to knowing this is a growing and developing product is keeping me here and I assume some of these will be resolved over time.

Small thing - I like the logo-ing and the purple:).

Developer Response ,

Hi there! We appreciate the honest feedback. The features you've mentioned are on our roadmap for the Proton Calendar iOS app, and we're adding your vote to them as well to help with prioritization. Our community's input is important to us and we rely on it for future improvements. If you have any additional suggestions on what we can do to improve, contact us at to let us know.

App Privacy

The developer, Proton AG, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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