While the app has not been updated recently (last update in 2016), it remains a favorite among audiophiles for its scientific approach to sound enhancement. Neutralizer - 4PDA

Users can create different profiles for different headphones or speakers to account for varying frequency responses.

The app conducts a across key frequency ranges. During this test, you adjust the volume for different tones until they are barely audible. The app then uses these results to create a custom profile that "neutralizes" deficiencies in your acoustic tract, ensuring a balanced and clear listening experience. Key Features of Neutralizer

Neutralizer was originally available on the Google Play Store but was unpublished in late 2024. It can still be found as an on various archive sites.

Use the slider to find the lowest volume at which you can hear each specific tone.