Nugen Visualizer 2 (AAX-DSP, too)
Nugen Audio have released their Visualizer 2 plugin which is either AAX-Native or can be purchased as AAX-DSP as well. 
Here's some additional info from Nugen web page
Comprehensive audio analysis
Multiple level meters (Peak/RMS/K12/K14/K20 etc.)
FFT Spectrum Analysis
Stereo Spectrum Analysis
Spectrogram
Stereo Spectrogram
Vector Scope
Stereoscope
Stereo Bias meter
Correlation Meter
Correlation by frequency
Stats and Parameters module
Comparison Mode
Comparison mode allows the direct comparison of two sources within a single Visualizer interface, utilising overlay, side-by-side and differential views. Ideal for examining the difference before and after a mastering signal chain or for comparing spectra in preparation for EQ matching or notching out.
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Main DAW: MacPRO 7.1, 16-Core Xeon 3.2GHz, 196 GB RAM, OSX 10.15.2, HDX3, PT 2019.12 Ultimate, 2x UAD-2 PCIe Octo's, Raven MTZ, 1x HD Omni, 2x HD I/O's, 1x MTRX and some more cool stuff...
Auxilary DAW: MacBook Pro with Retina Display (2012), 2.6GHz quad-core Intel Core i7, 16GB RAM, OSX 10.13.6, PT2019 Ultimate, 1x UAD Apollo Quad Audio Interface /w Thunderbolt Interface (v9.x)
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