Your music,
tuned to your ears

Spex tests your hearing on your own headphones, one ear at a time, then tunes every song to how you hear.

Download on the App Store

Free to download, with a free hearing test. For iPhone.

Now Playing in Spex, with the Strength slider

The hearing test, asking whether you hear the beeps

Hearing test results for each ear

Hearing the difference Spex makes

A free hearing test

Eight tones in each ear, played on the headphones you actually listen with. It takes a few minutes, and it's always free.

Each ear, its own EQ

Spex builds a separate equalizer for your left and right ears from your results. One Strength slider sets how much.

Every pair of headphones

Keep a profile for each pair. Spex switches to the right one when they connect.