Ars technica writes: "Don't Fret! Guitar Fretboard Trainer is an application for the iPhone and iPod Touch that allows users to learn and drill the notes on the fretboard of a guitar. The application offers two modes of play, "Find Fret" and "Find Note." Users are given either a string number and note name to find on the fretboard or a note on the fretboard to name. The application is an interesting use of the iPhone's touch screen, and with more guitar players worldwide than you can shake a stick at, a few of them are bound to own an iPhone."