OnlyPure Piano Tuner

This is definitely a good app. But the reason why I gave it a four star rating is that it’s not properly calibrated to a 440. When I checked it with my other Tuning app and checked it with my Tuning for it showed that it was about, a few cycles off. I have to pull it up to A440 one to get a 440. if the developer can calibrate it to where it’s supposed to be I would give it a five star rating. As far as accuracy and tuning the piano itself it is great. Tune spin it pianos very well. Just make this one correction and it would indeed be great.

The best piano tuner app I have tried. As an amateur, I am surprised they advertise it as only for the professional. It even allows for unison tuning non-aurally, as aural tuning can be a challenge without training. Overall, very easy to use.