I don't know much about running a bar apart from being a regular and sticking around for closing time every now and then.

This looks like an opinionated frontend for a spreadsheet. There are tons of those already. Does this really reduce any of the complexity well enough to be better?

I think people would be more convinced with a demo compared to the existing workflows it's trying to replace.

It’s hopefully an alternative to paying a company like Orca $200/mo. (It used to be $5000 annually, sold solely on the value of potential losses saved.) https://orcainventory.com/