Selecting the string to tune on the app’s guitar headstock, TyroTuner’s meter shows whether you’re too low, too high or just right and as you tune. An alternate mode measures the tone coming in and highlights which string on the guitar you’re closest to tuning properly.
Very intuitive to use. 
No alternate tuning types. Doesn’t emit reference tones.
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Links:
[1] http://www.maclife.com/article/reviews/tyrotuner
[2] http://www.maclife.com/article/guitar_method_3_0
[3] http://www.maclife.com/article/optek_music_systems_fretlight_fg_431_vintage_electric_guitar
[4] http://www.maclife.com/article/video_air_guitar_tutorial
[5] http://mauvilasoftware.com/iphone/tyrotuner/support.html