In addition to a metronome with tap tempo and a tuner that detects incoming pitch or plays tuned notes, a comprehensive chord chart shows the fingering for thousands of chords. You dial in any chord variation in the book, and the app will shows how to play it in as many as seven different ways.
Most complete app in its class. Tuner, metronome and chord chart. 
Only three tuning types.
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Links:
[1] http://www.maclife.com/article/guitar_method_3_0
[2] http://www.maclife.com/article/optek_music_systems_fretlight_fg_431_vintage_electric_guitar
[3] http://www.maclife.com/article/video_air_guitar_tutorial
[4] http://guitartoolkit.com/