A personal finance app called “Predictable” that takes chaotic sloshes of money and turns them into steady streams of cash. You tell it “I receive this much money weekly/monthly/on the first and fifteenth/when Mercury is in retrograde, and I have these expenses at other various intervals” and it evens everything out into a constant weekly flow of cash by, essentially, buffering. Any overflow or underflow goes to a “margin” bucket which basically tells you how much you could spend right now and still have enough for all your recurring expenses.

Currently making it just for myself but curious if anyone else would find it useful.