*Handy 4-octave piano keyboard
*Find the name for complex jazz chords
*Discover the elusive rich voicings real jazz pianists use

Tap notes on the keyboard and see the chord's name accurately displayed - then you can transpose it.
Or you can build a chord from its name and see how to play it in one of three styles:
a) Basic condensed form
b) Improved spread of notes
c) Shows root note (lowest) plus a typical one hand jazz voicing