[audio spectrum analyzer ... ]

[Link]

Ein Spectrum Analyzer erfasst und stellt ein Audiosignal im Frequenzbereich dar. Das dargestellte Bild wird als Frequenzspektrum, kurz Spektrum, bezeichnet.
https://tonstudio-wissen.de/spectrum-analyzer-darstellung-frequenzen/


Spectroid is a real-time audio spectrum analyzer with reasonable frequency resolution across the the entire frequency spectrum.
Sauberes Design, keine Werbung, funktioniert schnell und zuverlässig. Ein umfangreiches Menü erlaubt viele Einstellungen bez. der Darstellung der Skalen. Die Mikrofonqualität des Telefons ist bestimmt ein einschlägiger Faktor für die Erfassung; auf meinem Gerät jedenfalls zeigt Spectroid präzise alle Frequenzspitzen aus der Umgebung an.
https://play.google.com/store/apps/details?id=org.intoorbit.spectrum&hl=de

Real-time precision audio spectrum analyzer for professionals and sound enthusiasts. Spectrum analysis with Audizr reveals outstanding details in sound captured from a microphone. Monitor sound frequency content of your home studio speakers or a PA system with a greater accuracy than a human ear could ever reach. Zoom effortlessly in on interesting details through an intuitive touch interface, and adjust your equipment to perfection.

Audizr is optimized by professionals for precision and stability. You will get amazing frequency resolution (up to 3 Hz with 48 kHz sample rate) and low latency, which helps you to discern even the slightest anomalies in the sound. It stands out from the competitors with usability without losing a freedom of professionals to choose their preferred parameters themselves.

Features include (but are not limited to)
- Real-time audio spectrum analysis of a microphone signal
- Waterfall spectrogram
- Long average over a time window of up to a minute (RMS)
- Real Time Analyzer (RTA) for measurements with pink noise
- FFT with rich configuration
- Max hold and reset
- Logarithmic, Mel and linear frequency axis scale options
- Tap to observe a certain frequency
- Zoom individual axis by pinching on the edges of the screen
https://play.google.com/store/apps/details?id=audizr.android&hl=de

[Link]

This audio plugin can be loaded into any audio host application that conforms to the AudioUnit or VST plugin specification.  Plugins with AAX version available can be loaded in ProTools 12+.
This plugin is compatible with Windows (32- and 64-bit Windows XP, Vista, 7, 8, 10 and later version, if not announced as unsupported) and macOS (10.8 and later version, if not announced as unsupported) computers (2.5 GHz dual-core or faster processor with at least 4 GB of system RAM).  A separate binary distribution file is available for each target computer platform and audio plugin specification.  If supported on a specific processor, the plugin may internally utilize AVX2-optimized code.
Compatible Windows and macOS plugin software: Cubase, Logic Pro, ProTools, Ableton Live, Reaper, Presonus Studio One, FL Studio, Cakewalk, Nuendo, WaveLab, GarageBand, Vegas, SoundForge, Audition, Samplitude, Digital Performer, Mixcraft, Bitwig Studio, Edius, others.
If you cannot get plugin to work on macOS High Sierra/Mojave/Catalina, you have to logout from the system and login again, it's a known issue not caused by plugin's own bug.
https://www.voxengo.com/product/span/