Audiobus: Use your music apps together.
What is Audiobus? — Audiobus is an award-winning music app for iPhone and iPad which lets you use your other music apps together. Chain effects on your favourite synth, run the output of apps or Audio Units into an app like GarageBand or Loopy, or select a different audio interface output for each app. Route MIDI between apps — drive a synth from a MIDI sequencer, or add an arpeggiator to your MIDI keyboard — or sync with your external MIDI gear. And control your entire setup from a MIDI controller.
Download on the App StoreAudiobus is the app that makes the rest of your setup better.
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Blue Cat Free Pack includes a spectrum analyzer and a bunch of other usable plugins.
https://www.bluecataudio.com/Products/Bundle_FreewarePack/
Also Melda probably has a spectrum analyzer in its free version plugins. I definitely know it has a stereoscope because I use it all the time.
https://www.meldaproduction.com/MFreeFXBundle
The TB Spectrogram is free on the desktop as well...
...you need to install all the other stuff as well, but even in 'demo mode' you can still use them to process sounds which is nice!
https://www.toneboosters.com/index.html#anchor_download
Also all the previous V3 TB Plug-Ins are FREE!).
The link to all the free V3 plug-ins is on this page https://www.toneboosters.com/support.html
Under...
Where can I find older (legacy ßv3) plug-ins?
Cheers!
my fav is def SIR Audio Tools SpectrumAnalyzer
I prefer the paid for version for multi ch support + advanced options but free version is also amazing
second choice is def Melda FreeFXBundle with MStereoScope + MAnalyzer
MMultiAnalyzer is also %61 discount on PB - 25$ until feb 28
there's also
voxengo span
cqt analyzer
occular scope
oscarizor | free-paid versions
wave observer - oscilloscope + monitoring
audec has stereoscope + vectorscope but stereoscope is not M1 compatible afaik