Just type in any frequency and play it on your mobile. It is useful for music technicians, audiophiles or anyone who wants to understand how different frequencies sound.

The major musical notes are pre-configured in the app so that you don't need to know their frequencies.

The app allows you to specify any frequency between 1 and 22000Hz, more than the audible range. Please note, however, that the tone generation is dependent on your phone's software and hardware such as the speakers . Again, it is unlikely that anyone would be able to hear the full range of sounds as each individual will have their own hearing limitations.