low-profile hexagon keyboards.

isomorphic keyboard layouts

The 0x33.board supports various different isomorphic keyboard layouts based on hexagonal grids. The current layout and the note to start the scale with in the bottom-left corner of the main grid can be set in the settings screen.


The Wicki/Hayden Note Layout is an isomorphic note layout conceived and independetly rediscovered in 1896 and 1986 respectively. The intervals between neighbouring keys are 2, 5 and 7 semitones, arranged such that a whole-tone scale lies horizontally along rows. The keys of an octave repeat vertically every second row.


The Jankó keyboard was designed in 1882. Neighbouring keys are 1 or 2 semitones apart and arranged such that keys that are on a vertical line correspond to the same note.

harmonic table

The Harmonic Table note-layout is known since at least the 18th century. The intervals between keys are 3, 4 and 7 semitones.


I can’t find much on the name and origin of the Gerhard layout. Neighbouring keys are 1, 3 or 4 semitones apart.