Piano Companion (Android) app for $1.95
Piano Companion is a flexible chord/scale dictionary with user libraries and reverse mode. Piano Companion allows you to find a chord or scale by its name. If you don't remember what's the name of a chord or scale it helps you to find it by keys. Piano Companion shows chord/scale notes, degrees, fingering for both hands in major and minor scales. You can listen how a scale or chord sounds. The great advantage of Piano Companion is the fact that it's a growing application, so we will be glad to consider any new features which helps you to increase usability.