SPAN is awesome. It has all that you can desire from a spectrum analyzer. All the info, all the analysis, everything you need to have all the data of your song. Put it at last of your master channel and see in real time how your mix/master is going. and it's free.
I use version 3.1 with Logic Pro X 10.4.2 on High Sierra. Never had a problem/crash.
How should I read this analyzer? The answer is completely different than waves paz. Is it a question of settings or is the scale of representation of the values really different? Is there any way to be able to set it as waves paz?