Remember Flow, Amazon's augmented reality shopping aid that kinda sorta worked? Well now you don't have to, because the functionality has been rolled into the main Amazon shopping app. Now you can scan barcodes and even full products (at least some of the time) to compare their prices to everyone's favorite online megamart. And incidentally, you don't need a second app to do it.
The Flow features work best with a barcode, but the camera scanner will try to identify anything.