e-shunt app for iPhone and iPad

e-shunt is an application for the visual study of sound.
Features
•View the frequency components of sound (displays the loudness of high and low pitched sounds)
•View sound waveforms
•Record (up to 3 minutes)
•Playback
•Send recorded files via e-mail or AirDrop
•Change the appearance
Other features include the ability to record sound frequency components as a CSV file (200 Hz to 3 kHz) for research purposes and a bar graph displaying the ratio of high to low tones.
For input, in addition to the built-in microphone, a microphone connected to Bluetooth or Lightning terminal can be used.