Disclosed is a graphical user interface operational on a portable device that allows users to test their minimum audio hearing level at various frequencies using a single button. The graphical user interface generates sound frequencies that are played to the user, one ear at a time. Starting from zero decibels, sound intensity levels are gradually increased to intensity levels perceptible by the user. The users indicate recognition of the sound frequency by interacting with the graphical user interface. The intensities of the sound pressure levels (SPLs) are registered as estimates of a user's hearing sensitivity at the tested frequency bands. The process is repeated at different frequency bands for each ear, and hearing levels for each ear established.
