I have been using Pixter for about 1&1/2 years now; it was the best OC reader that I could find for iOS, although it can be a bit finicky. The quality of the output is a function of the picture quality of the document being read. I most often use it for importing recipes from magazines into the AnyList app, and typically have to cut or crop the input photographed document into bite-sized pieces, so that Pixter can turn into ASCII characters. It has trouble if the text in the photos changes in font size, colour, or background, or is angled; I try to use Microsoft Lens to take & prepare the photo for reading, but it still usually takes, perhaps 4 to 6 pictures to copy approximately 200-300 words of a recipe. It is not a desktop OCR suite, but it will do the job, if you coddle it a bit.
The Momlady about Pixter Scanner OCR Document, v2.2