I really like the idea. Having a bird's eye view of money flow is central to building and maintaining a strategy. I have been looking for this kind of tool for years, and currently am using a spreadsheet for this, as nothing worked for me. This simple diagram is so much clearer.
But you need to refine the UX, which is barely usable at the moment: it took me a few minutes to understand how to change the numbers. I am still not sure how to add pockets. The name pocket itself is not very descriptive to me, but I am not sure how I would call them. Maybe just « entity », and have a few variations of them (income, accounts, etc).
I would need pockets that take a percentage of another one, such as tax withholding.
This feedback is not structured, but I really like this idea and hope it will help