EarTrumpet is described as 'Advanced volume mixer for Windows 10 and 11 providing per-app control, device switching, audio visualization, hotkeys, automatic updates, and modern interface' and is a very popular Volume Control tool in the audio & music category. There are more than 25 alternatives to EarTrumpet for a variety of platforms, including Windows, Mac, Linux, Android and Google Chrome apps. The best EarTrumpet alternative is FineTune, which is both free and Open Source. Other great apps like EarTrumpet are Volume2, ModernFlyouts, SoundSource and FluentFlyout.
It's only a superficial visual change