Scales & Chords: Guitar PRO is an app for guitar players, ideal for watch-and-play!
The PRO version includes:

• 42 scales with all their rootnotes*
• Basic major and minor chords.
• Dynamically change scale
• Dynamically change tuning (All possible tunings, tune up or down each string individually)
• Acoustic tuner

*Full scale list: Major, Minor Descending, Minor Ascending, Harmonic Minor, Pentatonic Major, Pentatonic Minor, Pentatonic Blues, Pentatonic Neutral, Byzantine, Arabic, Spanish Gypsy, Romanian Minor, Chinese, Japanese A, Japanese B, Dorian, Phrygian, Lydian, Lydian Augmented, Lydian Minor, Lydian Diminished, Mixolydian, Locrian, Mixo-Blues, Hungarian Major, Hungarian Minor, Javaneese, Jewish, Hawaiian, Hindu, Neopolitan, Neopolitan Major, Neopolitan Minor, Oriental A, Oriental B, Overtone Dominant, Persian, Super Locrian, Major Blues, Prometheus, Diatonic, Dominant Pentatonic.