The Jankó keyboard with its “6-6” layout was designed by Paul von Jankó in 1882. Because it has an isomorphic layout, each chord, scale, and interval has a consistent shape and can be played with the same fingering, regardless of its pitch or what the current key is. If you know a piece of music in one key you can transpose it simply by starting at a different pitch because the fingering is the same in every key.

This layout has been adapted to the constraints of an iPad screen AUv3 window. As such it doesn’t have the full six rows, but you can access the full range of notes using the tabs at the top.

Unfortunately this surface can’t be played by dragging your finger like other soft keyboards. You do have to tap each key because the keys are implemented as button objects.

I created this in response to a question by @LeftyChris on the Audiobus Forum: https://forum.audiob.us/discussion/56441/any-janko-keyboard-ios-apps. It can be an interesting way to look at things, and may release some creativity as a result.