Hi audio freaks!
Do you know if there is any vst or hardware analyzer that shows how the sound is richness in frequency spectrum?
For example, I mean I have reference track and when listening to it, the analyzer show maybe in colors or anything how the spectrum is filled so then I could listen to my track and say ' ok, I need to make next lead layer in for example 3000-6000 hz because that frequencies are not so rich or so full as others.

Im sorry for my English if Its hard to read but I tried to describe what I was meaning

 

If by "richness" you mean harmonic density, then you can learn to see it on any spectrum analyzer. That being said, it's better to learn to hear it instead.
You see, there's no "richness" and "fullness" in the spectrum by itself. It's all psychoacoustics and how instruments blend together. You need a full-fledged general AI to distinguish and formalize these things in the mix. So you'll have to rely on your own general intelligence and whatever audible information you have access to for the time being.