If I have to pull out my mobile device to read QR codes, I want an app that’s fast, locks on, and scans codes quickly without any fuss. While there’s a plethora of QR code scanners on the App Store, ...

— -- QR codes, those barcode-like images that can be scanned by smartphones, are showing up in magazine ads, on product shelves and billboards. We even saw one the other day on a dog collar. Taco ...