Designed as a high-tech marketing resource, QR (quick response) codes have many useful applications. These (usually) black-and-white algorithmic codes are gateways to a potential multimedia nirvana.

During the halftime show of this year's Super Bowl, a floating QR code took a star turn in a prominently placed advertisement. That ad, which was run by cryptocurrency exchange platform Coinbase, ...

Now that Google is using the two-dimensional bar codes as part of its local businesses listings program, it's all the more reason for an app to help read them. CNET contributor Don Reisinger is a ...