★ Requires iOS 7 ★
I envisage a time in the not too distant future when we'll all have a permanent barcode or QR code on our foreheads (OK, I admit, I watch too many sci-fi films) and it'll make dating a whole lot easier (or more challenging, depending on the way you look at it).
For the moment, Barcode (from the creators of ProCamera) only works on objects (and those with scannable tattoos). Despite the name, it's a barcode scanner AND QR code reader. The app scans the code automatically and brings up a choice of actions (add contact, call number, open in Maps, open URL…). Great for price comparisons and a whole host of other applications, Barcode normally costs $0.99 but today it's FREE!