We made Project Costing app to quote ball park pricings for different projects. we often build software for clients. people like to ask for general cost range which is hard to calculate off the top of our heads. so we biuld this app to help out with pricing. Depending on the feedback and users reviews, we plan to add more features, and invoicing to help with complete billing needs of services companies. It can be used for costing construction projects, handy crafts, clothing, software and hardware requirements. While, we use it for amazon sales it isn't tied to that platform. I left the options open to be of use in as many cases as possible.