Just like many conditions, hearing impairments are very individual affecting each person in  different ways.  Many overcome their condition by using a hearing aid.  It may be confidence boosting for some to have a back up to their regular hearing aid should an issue arise with it.  There are many hearing aid apps for Android & iPad/Phone that perform general or more specific functions.  Below is a link to a popular Android aid but check other apps suitability before downloading this particular app.