Oscilloscope Plus is an app that uses your smartphone or tablet's microphone to show you the wave shapes of sounds around you

Oscilloscope Plus uses a two-axis graph to give a visual representation of a waveform over time, with the horizontal axis representing time and the vertical axis representing the amplitude

usage:
Touching the display will produce a vertical index line, which will
show the value at that point
Touch the left edge Y scale to adjust the sync level. A pointer will appear which can be adjusted by sliding up and down.
Touch the start icon to reset the level to zero.
In single shot mode the timebase may be changed to zoom in and pan
left and right using the right and left icons.

features:
- Oscilloscope refresh rate from 0.1 ms - 0.5 sec
- Storage option - to stop clearing the oscilloscope display between traces
- the ability to choose the Audio signal input option
- the app comes with a dark mode

Permissions
This Oscilloscope app requires minimal permissions, but must have permission to access and record audio from the device's microphone