I have recently started using this budgeting App called Nudget it’s a side project from a Firefox engineer.
It doesn’t leverage open banking /connect to your account in anyway and isn’t on the road map.
I like that. Manually keying in stuff makes you really think about each transaction plus the UI/Flow is really minimal and pretty.
I have too many accounts to keep track of. I’d be much more inclined to use an open banking based system that let me decide where to place expenditure.