Hörtest für alle is an educational program designed for iPhone users, developed by Gerhard Schabel. This free app package includes a sound level measurement feature to assess ambient noise levels and a hearing test to evaluate auditory abilities.

The sound level measurement function allows users to start and stop measurements, displaying the peak level in decibels. It warns users that noise levels exceeding 80 dB can harm hearing and clarifies that the results are for reference only, not for precise measurements. Note that an external microphone may be required for accurate results.

The hearing test generates tones of varying frequencies and volumes for each ear, requiring user acknowledgment of sound perception thresholds. The app provides a graphical representation of the results, offering an indicative assessment of hearing abilities. However, for a reliable hearing test, users are advised to consult an ENT specialist or an audiologist.