EyeNote is a free app that makes U.S. paper money accessible to the blind and visually impaired. Created by the U.S. Bureau of Engraving and Printing, the Eyenote app uses the native camera on the mobile device to scan paper money and then it speaks the denomination as well as displays it in large numbers. The app can be voice activated and uses "continuous recognition" technology so that there is no need to hold the phone or tablet still or to capture a photo. It's easily used when the banknote is held in one hand and the mobile device is in the other hand. It doesn't matter what angle or which side of the bill is used. It doesn't even matter if part of the bill is covered by your hand, although at least half of the note needs to be visible.
Eyenote is not able to authenticate a note as either real or counterfeit. Eyenote requires iOS 5.0 or later. It's compatible with iPhone, iPad, and iPod touch. You can get Eyenote at the iTunes App Store.