Optima Guitar Tuner is a real-time chromatic tuner for iPhone, iPod Touch and iPadThis real time analyser listens through your device microphone as you play your instrument to determine how in-tune it is. * Real-time frequency display* Real-time cent display* Note and Octave displayed* Option to invert the colours on the main screen* Supports rotation* Defaults to A440 reference pitch but allows you to change this. iPod Touch users, please insert the microphone headset before launching the app