This app gives you current high, low and average prices for new and used books for sale on various venues on the internet. Just tap the Scan button and the ISBN is scanned using the rear camera on your iPhone. Once the ISBN is in the text box, then you just tap Get Prices, wait a few seconds and the aggregated prices appear in the yellow boxes. To do another book, just tap Scan again and the old data is deleted, ready for the next ISBN to be scanned.