Helpful but quirks
I find this app helpful although there are some minor issues. Some instruction seems to be missing when doing lessons. It is not until after the lesson is over do I realize what exactly you were supposed to be doing. Also, I feel it has a hard time hearing my playing as it just restarts the lesson at times. Otherwise, good app to help with practice.
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Uberchord — Learn Guitar. Chords, Songs, Tuner., v2.1.5