PrintForte is the application that lets you wirelessly print from the iPhone or iPad. It can print directly to many Wi-Fi printers and to any ETHERNET / USB printer attached to your Mac or PC via free helper application (PrintForteShare) installed on your computer.

Easy mobile printing of most digital content (Photos, PDF, Word, Excel, Powerpoint, text files and web pages) with flexible control and high printing quality.

This app supports more than 1000 printer models of many manufacturers (for example: HP, EPSON, Brother, Canon, Dell, Kodak, Lexmark, Xerox, Ricoh, Samsung, Sharp,) including WIFI / ETHERNET / USB printers and most of other OEM Brands.

you can view the demo video on youtube with keyword:
iOS printing with PrintForte, wirelessly print from iPhone, iPad - YouTube
How to print from iPhone, iPad, iPod Touch - YouTube
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Reviews on the full version of PrintForte:

"Awesome.This app found my printers and worked the very first time. It has many functions very cool, useful and this is a revolutionary app. Thanks developver for nice supporting. I would highly recommend this app be in "must have" list."

"I have been looking for an app that can help me easy to print and finally found this app that works well with my iPhone and EPSON workforce 630. Love it."

"This is exactly app that I expected for a long time. Thank so much!"

"Incredible! We have 4 kinds of different printers. It works well on all these printers without installing any driver. Thank so much!"