Love it, I think most classical vocalists would prefer to mark their range on a stave though. I know instantly if the note I'm about to sing is going to be a struggle by seeing where it lies on the page. It took me a couple minutes to translate this by working from middle C. (I'm a bass/bari btw)

Thanks. Great idea with a stave. I was thinking of rendering a piano and letting users to press the keys, but maybe stave is even better. Will experiment this.

That's really cool :) I transpose songs for my own adaptations, but I always have to check/remember which song I could sing at karaoke at the original scale.

Don’t know if it’s obvious from the song page on the website, but it also automatically suggests an optimal transposition for a song for your range. I use it to quickly figure out where to put a capo on my guitar.