Piano Companion is a music theory app which helps songwriters, producers, teachers and their students. It is a flexible piano chords and scales dictionary with reverse mode. If you can’t remember the name of a piano chord or scale, this app helps you to find it by keys. The Piano Companion app shows chord and scale notes on the grand staff, degrees, intervals, fingering for both hands in major and minor scales. Additionally, you can listen to how a scale or chord sounds in the loop or arpeggiated.