Hands-free scanning

CardNugget is built around one gesture. Open the scanner, hold a card in front of the camera, and the app does the rest: it waits until the card is steady, reads it, finds its price and shows it in the middle of the screen.

The price stays up for five seconds, long enough to read it calmly, then the scanner is ready again. Hold up the same card twice in a row and nothing happens: the app knows it has just seen it.