Is there an app for printing from a non airprint printer on my iPhone 6 Plus?

I currently use FingerPrint installed on my 2 Desktop computers to print on NON air print printers from my iPhone 6 Plus.

That works OK, but of course, you need to be near the 3 printers that are connected to my small network.

Is there an app in the iTunes store that will install on my iPhone 6 Plus (instead of installing on the Desktops) that will do the same thing?

Actually, I would want the app installed on my iPhone 6 Plus, my wife's iPhone 6 Plus, AND my wife's iPad 3

Would that app allow me to also print to other printers that are NOT on my network?