Audio Spectrum Monitor is a free multimedia application designed for Android devices that visualizes voice input through the phone's microphone. It provides a real-time display of the audio spectrum, allowing users to observe the frequency distribution of their voice. The app features a horizontal axis that represents a music scale and offers a display range of seven octaves from C1 to B7. Users can easily adjust the display position by dragging horizontally and can zoom in and out using pinch gestures.

In addition to spectrum visualization, the application includes a pitch detection feature that indicates the basic frequency of the input audio by displaying a blue vertical line on the music scale. Users can also record and playback audio for up to three minutes, with options to save and load recordings. The app supports screen rotation for better usability, making it a practical tool for musicians and audio enthusiasts who want to analyze their sound in real-time.