This app does exactly what it says it should. It TESTS your setup to see if you can print from your iOS device to printers on your network. If it is successful, it takes you to where you can buy Printer Pro Classic - which is $50. But, they also have Printer Pro - which is only $7. Both print from any app that supports the “Open In…” command.
steveald about Printer Pro Lite by Readdle