Asymmetry can be an indication of something more serious..
See your audiologist.
Great concept.
I use this app with a pair of bluetooth headphones. It is great to be able isolate each ear for asymmetrical losses.

This professional tool allows hearing specialists to fit and adjust personal audio amplifiers. It uses specific tones and offers control over four key parameters for customized sound profiles. Requires a professional account login.
1.6
September 15, 2017
This app has been updated by Apple to display the Apple Watch app icon. Update for language support in iOS 11
MoreAMP Fit is exclusively for hearing professionals who need to fit and adjust AMP personal audio amplifiers. Users must log in with a professional account from Starkey, Audibel, NuEar, MicroTech, or AudioSync.
AMP Fit allows professionals to select from 3 starting presets based on audiometric configurations. It also provides control over four key parameters: Low Frequency Gain, High Frequency Gain, Overall Gain, and Output.
Yes, to use AMP Fit for fitting AMP devices, you must log in using your existing online professional account credentials from one of the supported brands.
The application works best with headphones that have foam padding resting on the ears, similar to those used for airplane travel, to ensure optimal tone transmission for adjustments.
Adjustments are made using '+' and '-' buttons to increase or decrease levels relative to the selected preset. The AMP device provides a confirmation tone after each preset change or parameter adjustment.
The latest version of AMP Fit is 1.6, which was last updated on September 15, 2017. This indicates infrequent updates for this professional tool.
AMP Fit is designed for Apple devices, including iPhone, iPad, and iPod, as indicated by its supported devices list. There is no mention of Android compatibility.
No, AMP Fit does not contain advertisements. As a professional tool, it is designed to provide an uninterrupted user experience for hearing professionals.