So, self hosting you do need a connection and pay? Look at the screenshot!
https://nostrcheck.me/media/public/nostrcheck.me_5367719401453007371708090781.webp
Discussion
https://apps.yunohost.org/app/vaultwarden
When you host your own you get all the features and don't have to pay. I run mine on yunohost but there are other options too.
I will check out that website. Is it on some Webspace possible or do I need own hardware for it?