It's a so basic feature for any service. Shocked to learn that I can not add an event while offline.

It is critical to be able to create new events while offline.

Calender offline use is essential, basic function for a calender app. Pleas ad it asap.

As someone who travels to remote locations on a regular basis, this has been a persistent problem The desire to "cache" emails locally for offline use is useful to critical depending on the situation.

This post below does a little better to add context.

https://protonmail.uservoice.com/forums/284483-proton-mail/suggestions/47527058-mobile-apps-option-to-store-all-emails-in-the-acc

The iOS app is working perfectly for me EXCEPT;

I only have 4 things I have found I miss multiple times a day:

1) add calendar entries off line in the app to then update when internet available

2) the ability to change the calendar that an entry is filled under

3) being able to search for an entry/keyword - works on desktop, not on iOS

4) the ability for everyone sharing a calendar to edit that specific calendar (currently only the creator of the callendar has that privilege)

Fix these, it would be perfect for me/my family

I totally agree, but without the need for bridging (though some people may like that option also) as I like the proton calendar app.
This needs to be available on mobile devices too, not just desktops/laptops.

Very important to have this option on mobile devices. The bridging on the desktop is not enough as we cannot carry our laptops with us everywhere, and additionally I prefer the protonmail client app instead of other third party ones.

This is very important, and even though there is the bridging software on a desktop to make emails accessible via another mail client such as Outlook, it is not feasible to carry your laptop everywhere you go, and if you travel quite a bit you do need access to your emails offline at all times.
After all, other email service providers are able to do this.
I also like the protonmail client app, and would rather use this instead of going back to other third party apps.

Creating offline calendar entries on mobile is a must-have for me. It is quite annoying trying to create an entry and waiting forever because the connection is slow or even broken.

I also commonly find myself in situations where I want to note down a bunch of events without a network connection.

I realize that this is quite a bit of work to get working, but creating events offline and having them upload in the background when a connection exists would be very useful

Offline is a must. I also use a Business Calendar for android which is a superior calender app but I cannot sync it with proton. Only import.

The built-in app I used before was perfect; it was snappy (no web UIs), had Japanese localization, and most importantly, was not tied to my online status. The one big glaring downside was its coupling to google, which is why I switched to Proton for the time being.

Please implement offline mode asap; it's so annoying putting in an appointment, remembering you're not inside a local hotspot, and having to later remember to reopen the app, praying that the entry you made hasn't been dropped from RAM yet.

Hmm... Proton Calendar works for me while I'm offline. Maybe you want to report this is a bug?

I decided for the paid subscribtion to soon. Proton falls short on many aspects that other (free) mail and calender services allready have.
Please tell costumers in advance things like the impossiblity to use calender and mail offline. This should not have been offered in a payed subscription.

This is for me one of the main reason for not doing a full switch to Proton.
It's really a must-have feature for the mobile apps...

It would be great to be able to access read emails with the mobile app.
I have been already in situations, e.g. traveling to a different country, in which I was not able to access important information that I had in my protonmail account.

Do you think it would be feasible implementing this feature in the mobile app?

I can only agree. Not only is an offline view useful (i.e. think of mobile use, no Internet connection), it also allows to work on it, in case of a disconnect from anywhere. You simply sync the calendar with the server, when you go online with both versions.

Would really like the option to access some emails (if not all) on my iPad offline. This is critical for my continued use of this app.

Using the calendar offline is a big Must! I travel/work a lot in areas with almost no to no signal and without wifi access.

As anyone who frequently travels, being able to access and add/edit/delete entries while Offline for later syncing is a must have.
I would prefer this in your own dedicated app.
I can't use Proton for calendar purposes until this is fully implemented