Musicians and Sound Engineers.
Musical Notes and Frequencies and Wavelengths.
Now there's an app from dgApps
to convert between them all.
features a sliding fader to dynamically change frequency, wavelength and musical note, with locks to step through standard third octave frequencies or whole notes. There's also a built in tone generator so you can hear the frequency, and a frequency tracker so you can name a frequency, both with a waveform display. A settings section allows for different tuning standards, and variations in the speed of sound.
allows you to share its frequency, wavelength and musical note via all the usual sharing methods.
can receive the calculated local Speed of Sound from another dgApps