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From Jens Korinth:
GuitarScales is an app for guitarists that allows viewing many different scales with arbitrary base notes directly on a guitar neck. It displays the scale as positions on the neck, the names of the respective notes and highlights the base notes to ease learning of a new scale/base. You can also define your tuning, for instance show the scale in Drop D, an open tuning or a completely customized tuning of your own. * easy to use interface that allows zooming in and out of any position on the neck* supports many scales including major, minor, pentatonic scales (major, minor, blues) and church modes* allows to define a completely custom scale, which may also be transposed!* support for different tunings including open tunings* allows to define a completely custom tuning!* FREE version with iAds!