Frets 2 Keys app for iPhone and iPad
Frets 2 Keys is a musical reference tool to help translate notes, chords and keys between guitar and piano. Musicians can learn about the 12 major keys, the different chords within them and how they are represented on both piano and guitar. Guitar players can change tunings, and apply a capo to understand what notes they’re playing on their instrument.
Available on iPhone, iPad and Mac.