

Maybe one of these is interesting? I have no actual experience with them though:
https://github.com/DumbWareio/DumbBudget
They should all be self-hostable.
Edit: I don’t know of these all match your criteria. Maybe finance looks pretty Sleek imho. I just dread the thought of exporting my transactions and importing them because my bank is forking horrible w.r.t. integrations.
And logging in every time to do a CSV export is just annoying.
Edit 2: formatting
If just one or those passwords gets leaked you might find a lot of other ones get cracked as well.
It may not be sites that you care about. But using a password manager is a lot less effort and a lot safer than whatever technique the average Joe will come up with.
Any password that leaks which could indicate a potential system ( e.g.: sitename in lower/upper/leetspeak) makes the whole thing even more vulnerable.
Just use something. Bitwarden, vault warden, keepassxc, …
Knowing my social circle I’d recommend bitwarden. Even paying for it costs a measly 10$/year, while the free version is very usable in itself. And generating passphrases or 32char passwords will be a lot safer than whatever the hell they can come up with.
Just avoid the default browser ones, big tech and LastPass.