Been playing around with this thing and its neat. It's basically a tool that identifies harmonics of notes/chords.
Quite from the dev;
"Yeah it does that too. The whole spiral thing is meant to make you understand almost instantly not only what notes there are but also how each visible harmonic belongs with each other as most harmonics stack up into visible "branches" to form a recognisable shape. That's the big difference with a visualiser like SplineEQ's where you can see it all but it's hard to tell which note is playing or which harmonic you're looking at.
But unusually enough for a plugin I made this thing not to use on your own creations as much as to use on other peoples music for you to learn what's going on in there musically, with their synthesis or processing or even just the nature of their instruments sound (with Spiral you can see how each instrument looks like, whether its harmonics shake around like strings or Hammonds might do, whether you can mostly see the lowest harmonics like a flute or a piano or the higher harmonics like a saxophone or a clavichord, or all harmonics like a sawtooth, or whether notes glissando between each other like many synths do or are bent or slided like on a guitar) but also see and learn about the mixing and mostly as with the full version learn about stereo mixing. "
I think this could be a great tool for people trying to understand more about music theory and how different notes relate to eathother.
At the very least its worth the $5 to get wasted and stare at it for a few hours.