If you have an android phone, then you MUST install this. Besides being able to scan UPCs to compare prices, it is a great way to download applications or navigate to websites on your phone. Most web browsers have available plugins that display QRcodes for the current website, so if you find a website you want on your phone, instead of writing out a mile long web address or wading through a million google results just point your phone at your computer screen and push a button. One great use I've found this is following recipes I find online. I find a dish I want to make, scan the QR code, and a second and a half I have the whole recipe in my hand. I can take it to the store, in the pantry, wherever I am I can just pull out the recipe. Works great on my Behold 2. And if nothing else, the satisfying beep makes this app worth installing.