SignalView is described as 'Stereo sound visualization VST3 plugin. It has a time domain view and a frequency domain view with optional linear or logarithmic display. There is also a sonogram(waterfall) view to see trends in the spectrum' and is an app in the audio & music category. There are more than 10 alternatives to SignalView for a variety of platforms, including Windows, Mac, Linux, Android and Flathub apps. The best SignalView alternative is Friture, which is both free and Open Source. Other great apps like SignalView are Audio Spectrum Analyzer, WaveSpectra, Spectro and Spectroid.