We need ways to efficiently and accurately interact with the world. Caldav seems the best although I am not an expert.
This is really a problem to set up with Proton.

This is needed. For essential scheduling with self / small hosted calendars and contact lists.

Having the potential to use (external) scheduling tools in a secure way would be rather useful.
Maybe enable both a "free/busy" caldav (for bought and potentially untrusted external tools), and a full details caldav for integrating into trusted or even self-built software?

And for CardDav... I know I can use any other provider (from big tech to self hosted nextcloud) - card dav is a solved problem for me.

But collaborating using calendars with standards (and I am talking calendar standards, not HTTP) is still mostly absent making my calendar less useful than (say a big tech calendar) that I can connect using https://simplymeet.me/en/integrations or something alike.

One small step ahead would be an Android application that can sync cards to my proton drive. At least big tech then does not have my contacts anymore, and I have a back-up.

I know, I know, you don't support that. But PLEASE consider supporting it at least partially. I want Proton to be my one stop shop for security and identity.

Consider this. In order to be able to move to a privacy oriented Android release, I have to manually install APKs, switch to another authenticator because Proton Authenticator is not available as trusted build, and I have to pay for another service to store my contacts. (Also see my post on Obtanium)

The message is: as a non big tech customer I cannot really use Proton in a safe and integrated way. I am paying full fees and still have to piece together my security manually. It is just not sustainable.

It’s interesting that proton calendar is on-par with the rest of the suite but missing a fundamental component of calendar apps. Proton docs and spreadsheets are recent additions to the app suite so it makes sense (to me) that they’re missing numerous features that are standard across competitors. But a calendar app without scheduling after a decade live? I don’t have the expertise to say whether it’s technically impossible due to protons encryption measures, so it’s only my spidey senses telling me that even without third-party integration services on the table, a native app should be. It’s scheduling; the rest of the suite works with external tools, please just add this basic calendar feature

The lack of this feature is preventing me from completely terminating my use of Google products. I use a Light Phone 3 and even a dedicated partnership workaround through their dashboard would be appreciated. I have even managed to get my TRMNL display to show my Proton calendar. Being able to view/edit it on my LP3 is the final missing piece of the puzzle. It's wild to me that people have been asking for such a straightforward feature for 10+ years

Ok sorry but I'm now really considering moving to Tuta (similar privacy-friendly mail and calendar service) just because of this 10 years missing feature. Cmon developers!

To be honest, I'm not sure how frequently developers monitor these forums, but I truly think the only thing preventing people from doing a mass overnight exodus from Google to Proton overnight is lack of CalDAV support and any basic Google calendar features being paywalled by Proton. Besides the calendar, making proton my main client has genuinely improved my quality of life and experience using the internet, but this incompatibility with calendars is incredibly frustrating, and at this point, it feels unworkable and unreasonable for only this calendar to not being compatible with mainstream calendar clients.

tldr; please find a way to accommodate CalDAV support; the lack of integration of proton calendar into my existing tech ecosystem is unsustainable thanks for all your work :))!!!

literally begging for caldav support

Need this!

here here, this is essential, please support basic integrations

It's been ten years and I've been following this for four... come on Proton. I don't like being locked out of integration of my calendar with my self-hosted services.

Its really essential.
Niagara Launcher is half as good without caldav.

Missing standard integration makes this a vendor lock dead-end.

It is VERY annoying they don't provide these essencial features, because of "boo hoo security"

It is impossible to operate without this support. I recently switched to a Light Phone for improved privacy relative to the iPhone and android phones, and without caldav I can't track my calendar. In the near future they plan to implement carddav too. Seems I won't get past the free account. I was planing on using the family account. it was a no brainer, until this!

Would like to use with Light Phone via Caldav. Please implement it. thank you

So frustrating.
Please tell me that it's on the road map.

I think CalDav is essential for cross platform integration. Please consider adopting this utility for use with Calendar.