Could easily be 5 stars but... – UltraTuner - Ultra Precise Chromatic Tuner for Guitar, Bass, Strings, Brass and More Review

This is the best tuner out there, as long as you only use your iPad in the vertical mode. Because that's the only way it works visually. It will not rotate horizontally. So if you want to use it as part of a setup with Audiobuss, it's very disconcerting, as all the other apps using Audiobuss are set up to work horizontally. Which makes it very uncomfortable to use unless you use it as a stand alone. Get in the game guys !
Review by Digaudio on UltraTuner - Ultra Precise Chromatic Tuner for Guitar, Bass, Strings, Brass and More.