Marco Gianotta is a great friend and a formidable programmer. Some years ago he fulfilled my dream of seeing the overtone spiral in an interactive version, and he even added some opportunities which I hadn't dared to even dream of.
I am still confident that the overtone spiral/octave spiral is a most fundamental approach to the essence of music, and that this visualization may help not only to get a better grip of the nature of overtone singing and to relevant exercises, but also to get an important feeling for a very potent understanding and language which intertwines fundamental areas of conception as music, mathematics, and phonetics.
Lately I have translated the UI and info texts to Danish, and I would love to se a further dissemmination and awarenes of this beautiful program, so let me know if your translation skills are good enough to add more languages to the interface (so far it includes Italian, English, and Danish ... and Spanish, German, Romanian, and Finnish may be coming).
/Skye

Find the program here: https://suonoterapia.org/overtones/