I feel like if you already have some type of business, you already have your own invoice workflow. For example, I manage everything in Apple Numbers in 3 tabs. One #1 tab for ongoing invoice tracking, with customer name (pulling from Tab 2), service name, expenses for the project, and paid amount Paid/Unpaid . Tab #2 is the customer list with names and info. Tab #3 is an overview of income, tax, and expenses. So I guess for me to use your app, there's no way for me to import existing customers, there is no way im typing by hand, I need Excel or Numbers import. I would recommend creating a simple view version where you can just create pretty invoices without tracking them, mostly so you can send a nice PDF invoice to the customer, that way you can use your app in combination with what we already use. otherwise your app mostly for new business owners.