The "Male Female Voice Effector" app for iPhone offers users the ability to transform their voice into a female-like or male-like voice. By listening with earphones and recording, users can experiment with different voice effects. The app provides options to adjust pitch, allowing for higher pitches for woman-like voices and lower pitches for man-like voices. Additionally, users can set the formant frequency center to further customize their voice transformation.

Furthermore, the app features settings for reverb, volume control, and the option to reset to default male or female settings. Users can toggle effects on and off for pitch, formant, and reverb, and the app conveniently saves previous effect settings for easy access upon relaunch.