# Proton Calendar: Secure Events — Keep your schedule private

> Secure, private calendar for managing events and schedules with end-to-end encryption. (iPhone/iPad app by Proton AG.)

- Source: https://appshunter.io/ios/app/proton-calendar-secure-events/id1514709943 (this page in markdown: same URL + `.md`)
- Developer: [Proton AG](https://appshunter.io/developer/979659484)
- Category: Productivity, Utilities
- Price: Free with in-app purchases
- Rating: 4.00/5 from 1,415 App Store ratings · 612 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.0 · 185 MB
- Languages: American English, Belarusian, Catalan, Czech, Danish, Dutch, Finnish, French (France), Georgian, German (Germany) and 16 more
- Released: 2022-11-30
- Data updated: 2026-08-31
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/proton-calendar-secure-events/id1514709943/reviews.md

## What is Proton Calendar?

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/X: @protonprivacy
Reddit: /protonmail
Instagram: /protonprivacy

EULA: http://www.apple.com/legal/itunes/appstore/dev/stdeula

## Key features

- Agenda and day view
- View and reply to invites
- Automatic event addition from email
- Light and dark mode
- Multiple reminders
- Recurring events
- Cross-device sync

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Mail Plus (1 year) | $59.99 | one-time |
| Proton Unlimited | $149.99 | one-time |


## What do users think of Proton Calendar?

Overall sentiment: neutral

**Pros**

- 🚀 Intuitive interface
- 🔒 Secure and private
- 👍 Good integration with Proton suite
- 👍 Visually appealing design

**Cons**

- 🐛 Slow performance and crashes
- 🔍 Lacking search functionality
- 📅 Missing advanced calendar views (week, month)
- 🔗 Limited integration with other calendars

**Commonly reported bugs**

- Issues with time zone settings
- Notifications not working reliably
- Inability to edit shared events

**Most requested features**

- Widgets for quick access
- Ability to invite and share calendars with others
- Support for importing/exporting calendar data
- Customization options (colors, alerts, etc.)
- iPad-optimized version

## Recent user reviews (10 of 612)

All indexed reviews: https://appshunter.io/ios/app/proton-calendar-secure-events/id1514709943/reviews.md

### 4/5 — 日本語対応お願いします！

*2026-08-04*

UIシンプルで最高です！
今はなんとなく使えていますが、日本語対応していただけると日本人は使いやすいです！
よろしくお願いいたします。

**Developer response:** Hi! Thank you for the 4-star review and rating! We'll pass along your localization request to the team. If you have any other suggestions on what we can do to improve, feel free to let us know by editing your review.

### 3/5 — Moving from Cozi improvements needed

*2026-08-01, version 2.25.1*

We are going to migrate to Proton Calendar to replace Cozi so we have everything in one service.  Please can you add option to import all the public holidays and key dates from different countries.  Also can we please edit the colours so can assign to different family members or events like a colour for birthday.

### 4/5 — Great app

*2026-07-31, version 2.25.1*

Really like the app and all the other Proton apps. They are my go to. 

One thing that bugs me about the calendar app is the date isn’t shown on the app icon. I really wish it would be.

### 3/5 — Functionality feature limit

*2026-07-31, version 2.25.1*

The app doesn’t allow a yearly event on say the 2nd sunday in a given month. It allows it monthly but not yearly. I contacted proton and was told by Nikola that the developers weren’t adding that feature. Ive since deleted the app from all my devices and reevaluating my paying account. In a followup email from Nikola, i was told he will recheck with the developers about it. This makes one wonder if they were ever consulted in the first place. Who knows. I gave it 3 stars because it isnt fully functional and have gone back to apple calendar which does provide this feature. 
Response to developer, i deleted the emails with the ticket number along with the app. I stated who i communicated with.

### 5/5 — Secure Calendar

*2026-07-28, version 2.25.1*

UI is pretty good, a fine comprimise for zero knowledge personal and shared calendars. Looking forward to the 2026 app re-write. I tell all my friends to use ProtonCal.

### 1/5 — Proton isn’t focused on apps

*2026-07-22, version 2.25.1*

I’ve been a subscriber for a couple years now. In that time, I don’t think any of their apps have had an update. I’m glad a company exists that’s focused on privacy but their apps are stuck in 2005. It’s increasingly frustrating that you can’t do basic things - like set Proton Calendar as your phone’s calendar application. 
A word of warning to others, do not put all your eggs in one basket. You may find it’s nearly impossible to exit something if you ever change your mind.

### 3/5 — Missing important function

*2026-07-21, version 2.25.1*

There is no ability to search for an event (past or upcoming). This is very inconvenient and frustrating.

### 2/5 — Can’t delete canceled appointment invitations.

*2026-07-18, version 2.25.1*

VERY VERY ANNOYING!!

### 1/5 — Very hard to use

*2026-07-17, version 2.25.1*

This app doesn't have a responsive UI and the UI is broken in windowed mode - windowing/maximising stops working and the UI becomes unusably tiny. It's almost been a year since iPadOS 26 has come out and it's still this way. I'm starting to look elsewhere for my calendar needs.

### 3/5 — Slow and clunky

*2026-07-17, version 2.25.1*

This is the only one of the print on apps that isn’t useful. I find the whole process of adding meetings are invites to be slow and clunky and I’ve noticed it the number of times and I don’t get any notifications for my calendar events. Notifications are turned onbut not this one.

## Frequently asked questions about Proton Calendar

### What does Proton Calendar do?

Proton Calendar is a privacy-focused application designed to help you manage your schedule and events. It offers features like different viewing modes, the ability to view and reply to invites, and automatic addition of events from your email inbox. It ensures your schedule remains private and secure.

### How is my data protected by Proton Calendar?

Your data is protected by the same end-to-end encryption used in Proton Mail. Event names, descriptions, and participants are stored with zero-access encryption, meaning even Proton cannot access your data. The app is also based in Switzerland, adhering to strict privacy laws.

### Is Proton Calendar free to use?

Yes, the application is free to use. It is funded by its users, not by advertisers, which aligns with its privacy-first business model. This means there are no ads or trackers within the app.

### What devices is Proton Calendar compatible with?

The application is designed to keep your calendar in sync across all your devices. While specific operating systems are not detailed in the description, it implies cross-platform compatibility for seamless access to your schedule.

### What are the main benefits of using Proton Calendar over other calendar apps?

The primary benefit is its strong emphasis on privacy and security. Unlike many other calendar apps, it offers end-to-end encryption for your event data, no ads, no trackers, and no data harvesting. It's built with a commitment to user privacy, making it ideal for those concerned about their personal information.

## Version history (last 5 releases)

### 2.25.1 — 2026-06-03

Minor bug-fixes.

### 2.25.0 — 2026-03-25

Minor fixes and improvements.

### 2.24.0 — 2025-12-05

- updated translations
- minor bug-fixes

### 2.23.0 — 2025-10-29

- Timezones Settings

### 2.22.0 — 2025-09-23

Minor bug fixes

## Apps similar to Proton Calendar

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Calendars: Schedule Planner](https://appshunter.io/ios/app/calendars-schedule-planner/id608834326) | 4.7 (121,097) | Free | Productivity |
| [Tiny Calendar: Planner & Tasks](https://appshunter.io/ios/app/tiny-calendar-planner-and-tasks/id514917848) | 4.6 (20,601) | Free | Productivity |
| [minical - Planner & Calendar](https://appshunter.io/ios/app/minical-planner-and-calendar/id1558953048) | 4.8 (5,706) | Free | Productivity |
| [Google Calendar: Get Organized](https://appshunter.io/ios/app/google-calendar-get-organized/id909319292) | 4.5 (131,573) | Free | Productivity |
| [Simple Calendar: ToDo Planner](https://appshunter.io/ios/app/simple-calendar-todo-planner/id1422994973) | 4.6 (6,358) | Free | Productivity |
| [Tiny Calendar Pro](https://appshunter.io/ios/app/tiny-calendar-pro/id455210120) | 4.7 (2,373) | $19.99 | Productivity |

## More apps by Proton AG

- [Proton Mail - Encrypted Email](https://appshunter.io/ios/app/proton-mail-encrypted-email/id979659905)
- [Proton VPN: Fast & Secure](https://appshunter.io/ios/app/proton-vpn-fast-and-secure/id1437005085)
- [SimpleLogin - Email alias](https://appshunter.io/ios/app/simplelogin-email-alias/id1494359858)
- [Proton Drive: Cloud Storage](https://appshunter.io/ios/app/proton-drive-cloud-storage/id1509667851)
- [Proton Pass - Password Manager](https://appshunter.io/ios/app/proton-pass-password-manager/id6443490629)

All apps by Proton AG: https://appshunter.io/developer/979659484

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-31.*