Etar, Fossify Calendar
this post was submitted on 26 Feb 2025
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Self hosted WebDAV is probably your best bet. I have Tuta but use WebDAV for my calendar.
This. Hosting Baikal for calendar, contacts and tasks on RPi and DAVx5 + Fossify Calendar + Tasks on Android
Idk about E2EE, but I'm using self-hosted Nextcloud. Using CalDAV, you can integrate virtually any app. On Android I'm using DAVx5 and Fossify Calendar.
The advantage of Nextcloud is that it provides a lot of things in one package such as contacts, tasks, notes, files, etc. If you don't need those, it might be better to look at some of the other suggestions that only provide calendars.
I run this same setup. Do you have any issues with inviting others to calendar events? If i invite via fossify on my phone it never gets sent, but if i do it from the Nextcloud UI it goes through without issue.
I have no experience with inviting others to calendar events since I only use this setup for my personal calendar - sorry
Posteo.de is E2EE. It's $12 per year for email, calendar, and contacts.
I see in the FAQ they mention that "If you would like, you can encrypt your calendar and address book with your password. Therefore, only you have access to your data" (translated by myself into English, sorry if it isn't exact)
Is there any "downsides" to this in terms of interoperability with other calendar / contact apps?
Thank you so much for your suggestion, this seems like it fills the issues I had when researching mailbox.org
I used it temporarily and didn't notice anything. I left to use a custom domain, which they don't support.
I don't think it's E2EE, because it uses open standards, bur you could self-host (including on a VPS if that's easier) a Baikal server. It does contact sync as well, using the CalDAV and CardDAV standards.
Would it run ok on a SBC, such as a raspberry pi? I don't mind self hosting, but I don't have the space for a full blown server setup in my appartment sadly (as fun as it would be)
Oh yea, Baikal is incredibly light and they do publish an arm docker image. You could absolutely tun a bunch of other services off the same SBC if it's a RPi4 or stronger.
what E2EE options are available
both Tuta and Proton rely on their own apps, and don't necessarily integrate well with all operating systems.
If you're looking for options that are both E2EE and also use open standards for integrations, you're not going to have any luck.
This is sadly what I was fearing running into, but I thought I would ask here nonetheless to see what other options people have even if they require some compromises on my goals
How about EteSync?
Do you self-host or do you pay? Just curious what your experience has been with the two options :)
Thank you for the suggestion!
I am considering mailbox.org
I use anytype!
Theres a bit of a learning curve but it even has local sync (you can sync your phone/laptop even without WiFi using hotspot)
How reliable is the syncing? I currently sync a lot of things with Syncthing, and while it is great to not rely on a shady centralized cloud service, decentralized syncing also has its own problems (potential sync conflicts in my KeePass databases mostly)
It definitely seems like an interesting option though! Thank you so much :)
I haven't had any issues with sync - I often have to work in areas without wifi/data and I was amazed at the LAN aspect of syncing between my laptop & phone using hotspot with this app, The backup feature is great for peace of mind aswell.
One thing to note is that it seems to sync (encrypted) to their server, with no option to turn it off [yet]
Maybe take a look at FluidCalendar, I just found it but haven't tested yet : https://github.com/dotnetfactory/fluid-calendar It's still in early development but it may have what you need.
Alternatively, you can take a look at Baikal for CalDAV and CardDAV support : https://github.com/sabre-io/Baikal