Needs More Updates and Features
The app could be really good but it needs bugs worked out and more features.
Nice Calendar
I found the calendar easy to use. It had all the features I needed except one - colors. $50/year is a bit steep to get colors for calendar entries, when I don’t need more than the free level for any other service.
Now good enough to use
Proton Calendar is now good enough to use. Coming from Apple
Calendar. Like the alternative views (agenda, single day, 3 day and week) with a mini/Split View option when, say, looking at week view with a mini month view above showing dots for events on days of the month. Not sure if developers are planning it, but looking forward to being able to copy and paste events.
Calendar. Like the alternative views (agenda, single day, 3 day and week) with a mini/Split View option when, say, looking at week view with a mini month view above showing dots for events on days of the month. Not sure if developers are planning it, but looking forward to being able to copy and paste events.
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Slow and unusable
Proton offers amazing services and apps, but this one is a big disappointment. The app is so slow that it’s almost impossible to use it. On the App Store it’s advertised as having light and dark mode, but I cannot find where to switch. Finally, it does not work offline.
An absolute buggy mess
App crashes on startup after loading my calendars. I uninstalled and reinstalled. It doesn’t matter if I load from the widget or the app icon. Crashes within a few seconds of launching every time. Instead of spending their time trying to roast businesses on LinkedIn they should fix their broken mess of an app.
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So slow to open
Have no clue but it just sits there for a wee while saying preparing.
Moving in the right direction
2026 Aug update - tried again but to be honest, only having the calendar colour in a little strip on the left looks bland and is no real help.
Calendar is the weak link in the Proton system. Take a look at Awesome Cal as this is the level I’d need before I can switch.
The rest of the Proton ecosystem is superb.
2026 update - moving in the right direction. Still some way to go, as import from Apple calendar still a pain and full day and timed events look exactly the same.
Also less urgent but also needed is the ability to import local Outlook pst archives.
The Proton Bridge app seems ideal to span the intentional gap imposed by Apple to lock us all in.
I hope one day there will be a Proton Messenger so I can fully remove myself from the icy grip of Apple.
2025 July update - A big step forward with an iPad friendly version. Definitely moving in the right direction. An extra star for the improvement and another for the positive developer response. Thank you. Now need to import calendars into Proton, so I can remove them from Apple.
2025 June update - How can it be that over a year has passed and STILL there is no advances? Still can’t easily import Apple calendar or Outlook pst. Still no iPad app. Down to one star.
Real shame, as Proton is a great email.
Original review - Needs to at least compete with the basic Apple Calendar app; and that means a widget, an iPad version and offline use. When I looked at the ‘add calendar’ option, it didn’t show the calendars I already have set-up on my iPad. No way I am inputting nine years of calendar information by hand!
Compared to the other apps, Calendar seems to be an after thought.
I would like to get in to the Proton Ultimate system but this and the poor/lacking support for importing/exporting from/to Outlook pst archive in Proton Mail make it a non-starter. A sync add-on for Outlook would solve this but I doubt there will be the demand to make it worthwhile.
Calendar is the weak link in the Proton system. Take a look at Awesome Cal as this is the level I’d need before I can switch.
The rest of the Proton ecosystem is superb.
2026 update - moving in the right direction. Still some way to go, as import from Apple calendar still a pain and full day and timed events look exactly the same.
Also less urgent but also needed is the ability to import local Outlook pst archives.
The Proton Bridge app seems ideal to span the intentional gap imposed by Apple to lock us all in.
I hope one day there will be a Proton Messenger so I can fully remove myself from the icy grip of Apple.
2025 July update - A big step forward with an iPad friendly version. Definitely moving in the right direction. An extra star for the improvement and another for the positive developer response. Thank you. Now need to import calendars into Proton, so I can remove them from Apple.
2025 June update - How can it be that over a year has passed and STILL there is no advances? Still can’t easily import Apple calendar or Outlook pst. Still no iPad app. Down to one star.
Real shame, as Proton is a great email.
Original review - Needs to at least compete with the basic Apple Calendar app; and that means a widget, an iPad version and offline use. When I looked at the ‘add calendar’ option, it didn’t show the calendars I already have set-up on my iPad. No way I am inputting nine years of calendar information by hand!
Compared to the other apps, Calendar seems to be an after thought.
I would like to get in to the Proton Ultimate system but this and the poor/lacking support for importing/exporting from/to Outlook pst archive in Proton Mail make it a non-starter. A sync add-on for Outlook would solve this but I doubt there will be the demand to make it worthwhile.
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Slowly replacing Le Google
Issue with subscription calendar only on the iOS app showing multiple instances of a subscribed calendar.
The event shows up ~15 times when it is on the day it’s supposed to happen. It stays there even after the event has passed.
Future events only show once, until it gets to that specific date.
Desktop app is fine.
The event shows up ~15 times when it is on the day it’s supposed to happen. It stays there even after the event has passed.
Future events only show once, until it gets to that specific date.
Desktop app is fine.
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Nice but missing
I like it but biggest thing missing to me is a search function. If i plan something wat ahead or if I want to know last time I did anything, I have to click every event till I find it
STILL Can’t delete canceled appointment invitations.
VERY VERY ANNOYING!! The developers have made some vague mumblings about fixing this a few times. STILL NOT DONE. I cant use my ‘paid for’ proton addresses in any other calendar app. My calendar has ongoing canceled long term appointments. My calendar could be full of these. VERY POOR. FIX IT. Dont mumble about …. one day, one day …… maybe……..
NOT GOOD ENOUGH. Deal breaker. Dont use.
NOT GOOD ENOUGH. Deal breaker. Dont use.
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No offline mode, slow & clunky
Whenever you are offline, this app will not allow you to add anything to your calendar. If you want to scroll through days quickly, you can’t do this, you have to scroll forward one day, wait for it to catch up, then scroll again, you go at its pace, not yours. If you want to change an event forward e.g. by one week, and that spans a change of month, you can’t see a mini calendar view, you have to already know which date one week forward is and use the scroll wheels to select a date. It’s all just so clunky…
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Not bad
No easy way to alter some notifications. And it’s very slow to save. Some custom events can’t be altered.
Good but needs some improvements
Needs to come up to par with other calendaring systems - love how it’s integrated with proton email but man it needs some love
Great app, small request.
Love the app, no complaints at all so far.
Just a simple request really, the yearly repeat option for events should have the same ability as the weekly, and monthly to repeat on days, not just dates. It would be greatly appreciated, and make adding come holidays to the calendar easier.
Just a simple request really, the yearly repeat option for events should have the same ability as the weekly, and monthly to repeat on days, not just dates. It would be greatly appreciated, and make adding come holidays to the calendar easier.
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。
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.
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.
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.
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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