Why not Actual Budget, which is also self-hosted, open-source bucket budgeting based off YNAB, however it appears to be a lot more mature.
They also transparently run the project on Open Collective which I like: https://opencollective.com/actual
does it have dark mode
Dark Reader solves that problem
Why self host a web app that could have easily just been a regular progam.
Control over your own data (if you mean regular program as cloud apps), or accessible on multiple devices and to different users if you mean an offline computer app
Different devices can be done with any program by putting the files on network storage.
hosting the db in a network storage? That’s self hosting with extra steps.
But i don’t have to run yet another service on my machine.