Proton Calendar User Reviews

Customer Experience

Positive experience41.5% of reviews
Neutral25.8% of reviews
Negative experience32.7% of reviews

~ Based on 612 written reviews from the US App Store.

What users say

Is Proton Calendar Safe?

Proton Calendar: Secure Events appears mostly safe based on user ratings. AppsHunter Safety Score for Proton Calendar is 80/100.

This assessment is based on 1,415 user ratings, with an App Store average of 4/5.

Safety Analysis

71.1% of ratings point to a safe experience
13.7% of ratings suggest some concerns
15.2% of ratings point to a risky experience

~ Based on 1,415 App Store ratings for Proton Calendar.

Is Proton Calendar Legit?

Proton Calendar: Secure Events appears to be a legitimate app. AppsHunter Legitimacy Score for Proton Calendar is 100/100.

Based on 100 of 100 points across 7 verification signals from App Store and developer data.

Top reviews

日本語対応お願いします!

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。

Response from developer

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.

Moving from Cozi improvements needed

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.
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Great app

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.

Functionality feature limit

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.
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Secure Calendar

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.

Proton isn’t focused on apps

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.
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Missing important function

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

Can’t delete canceled appointment invitations.

VERY VERY ANNOYING!!

Very hard to use

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.

Slow and clunky

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.

Feature Request

Hi! I really like the app. I would love it if you could add Liquid Glass to it.

The best and doesnt track me as a product!

Transitioned for google and im so happy. Proton ia gret.

Très bien mais

J’aime beaucoup cette appli à part 2 choses comparer à l’appli d’Apple (à laquelle j’etait très attachée à la base). De 1 nous somment obliger de voir un aperçu du mois en mode « jour » ce qui nous oblige à glisser à chaque fois la languette vers le haut pour le cacher. Et de 2, et qui est autant gênant, c’est l’impossibilité sur iOS de faire de recherche d’événement !
Sinon ont s’y habitue.
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Response from developer

Hi! Thank you for your review and feedback! We'll pass along your suggestions to the team. If you have any additional feedback on what we can do to further improve, let us know by editing your review.

Too basic

Misses too many options available in other calendars like Outlook. Search box for example would be nice so one can search for specific scheduled meetings or appointments

Lacking some visual optimization

Great app, and I love proton, however I fell like there some design aspects we could take inspiration from apple, the numbers of the calendar could be bigger and with some coloring to differentiate between weekdays and weekends, and the widget should show all the events in the near future instead of the “+x” that makes you open the app to see if there’s something important coming.
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Response from developer

Hi! Thank you for your review and feedback! We'll pass along your suggestions to the team. If you have any other feedback or suggestions on what we can do to improve, please let us know by editing your review.

Gut aber es muss verbessert werden um mithalten zu können!

Funktioniert einwandfrei, jedoch vermisse ich Funktionen wie:
Akzentfarbe und Theme anpassen, Anfahrtszeit vor Termin, alten Kalender importieren & Icon auf Home Bildschirm anpassen: aktuelles Datum anzeigen lassen etc.

Response from developer

Hi! Thank you for the review and feedback! We'll pass along your suggestions internally for future consideration. Edit: Thank you for following up on your review! Your suggestions have been documented internally. Our community's input is important to us.

Great with one but

The app is great, driving on daily bases. BUT: ability to add events to non-proton calendars is the key feature that is missing unfortunately

Minute change suggestion

This is a good app. I’d recommend adding a feature that allows users to change the minute column to increments of 5 instead of 1. That would reduce options from 60 to 12, making scheduling more efficient, and few people schedule at times outside of increments of 5.

Need watch app please

Works great on phone and iPad but missing watch app. Add watch support and I’ll change rating to 5 stars

No offline mode

the fact that this doesn’t have an offline mode is unforgivable