Spectro Real shows a frequency spectrogram over time and can be used for any audio signal, especially for voice signal analysis. Look up harmonics and formats of human voice as well as articulation and voice quality. It is also a nice biofeedback for speech and voice and offers a movable frequency line.
Minor performance issues.
Ratings and Reviews
Does nothing on iPhone SE
Does not seem to do anything at all
With Family Sharing set up, up to six family members can use this app.