I keep seeing Google reference QR codes for a variety of things in relation to the android phones on the market but I never really hear about QR codes and the iPhone. However, today I decided to see what was available for my phones crappy camera. It turns out there is one really good, and free, option - i-nigima. I saw it referenced in an article about books with QR Codes in them and then again in the comments on an article comparing other QR code readers for the iPhone.
I tried a couple of other apps before trying i-nigma and I have to say that i-nigma blows them out of the water. To test it I went to a website that will make QR codes for you (it was pretty cool too). I-nigma handled almost everything I threw at it. The only code it couldn’t read was for a QR code for text that was longer than 500 characters long. It was fine with URLs, Calls, SMS, and vCards and text up to 500 characters.
It’s pretty impressive really - so if you have an iPhone check it out.