I am not going to even try until it becomes a literal weekend project with zero maintenance and perfect reliability. Maintenance is crucial - I would not want to become the maintainer of two dozen apps that are genuinely useful to me. At 10€ a month the economics are not there. Even researching if the codebar database has perfect coverage in Spain like MFP sounds like more time than I would like to invest. I have a thousand other projects I’d like to build.