Use calendar offline
I don't really mind whether its a bridge to an existing app - Apple Mail, Lightning - or adedicated proton app but I need a calendar that I can use (rather than just view) offline. That means adding and editing events. This seems to me a pretty basic function, without it Proton Calendar is not much use to me. I am offline a lot of the time.

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Luca Di Grazia commented
I think CalDav is essential to use the calendar on multiple devices. Please add the support, it is very important!
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Yusuf M commented
Agreed. I signed up for premium because I just assumed that like any modern system, Proton's calendar would have CalDav support. I'm going to switch when my renewal comes up. Not having the calendar available in the field and not being able to merge it with other calendars makes it useless.
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S Kwok commented
Agree - if there is a bridge available on iOS to the native calendar app, this will be so helpful. I can also have the calendar notifications / visibility on Apple Watch.
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Joachim VH commented
I agree with this
I also refer to another suggestion that integrates this suggestion:
https://protonmail.uservoice.com/forums/945460-general-ideas/suggestions/36650287-all-in-one-proton-desktop-app -
MasonWilliamL commented
This should be available on all platforms (starting with Android and iOS since they already have apps). Sync back once the network returns.
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Nazareno Redi commented
This is one of the missing features that prevents me to go to paid plan
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Joel commented
It's not necessarily an offline calendar that I need, but integration with offline applications. I'd love for Proton Calendar to be able to sync with Gnome Calendar so that I get proper integration into my desktop environment, native notifications for events, etc.
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Maja commented
I agree. I love proton, and I like the proton set up, but proton calendar only via web and no option to make it work when offline is a problem. Currently for me I can't even 'view' when I'm offline.
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Philip commented
I agree. Right now, I need to augment ProtonMail with MS Outlook just to get some basic offline functionality on my devices.