Around 17 million people have download the QR Droid app on their Android based mobile phones to scan and create QR codes. The newest version of the app was recently created. The new version features automatic site registration, login, and purchase through QR code.
The QR Droid (Android) and Zapper Scanner (iPhone) apps have a simple interface and it lets you scan retail products online and offline. You can compare prices and read associated product reviews.