This app can display the pitch of one voice/sound at a time: https://play.google.com/store/apps/details?id=com.tadaoyamaoka.vocalpitchmonitor
It gets messy however if there is more than one sound. I am looking for an app similar to this one, which can display the pitch of two voices/sounds simultaneously. It should have the musical notes labeled on the graph, as the screenshot above. Does anyone know of any such app? Paid/unpaid or mobile/desktop, anything works.
I've tried using a more serious spectrum analyzer, such as this one: https://play.google.com/store/apps/details?id=org.intoorbit.spectrum
However it shows too much information, and doesn't display the notes of the (or a) scale.