music library managers

I've been trying to find an "offline music player" (that phrase seems to be the best for finding these apps), but the options are dire. There aren't many, not for macOS or iOS. I feel confident in saying that this is because Apple's Music.app is just the best option for music library management for the simple reason that it respects metadata tags - such as something simple like the "sort as" tags! The only other app I have found that does that is Vox.

On macOS, I have resigned myself to using Music.app. Until a library management app comes around that doesn't have weird window constraints and respects the "sort as" tag, I will just keep using Music.app. (Looking at you, Petrichor!) Luckily, you can turn off Apple Music the streaming service and Music.app functions largely as iTunes. On iOS, it's a different story.

I'm looking for an iOS app that includes an equalizer. There are a handful, but they are either expensive, ugly, or both! Here is what I have found and tried:

I'm not subscribing to an app and 50 USD is just...not doable, not right now and not for, frankly, ugly apps.

Music.app is fine on my MacBook; I have an old iPod Touch that I can only sync through Music.app anyway and I'm using a system wide equalizer. But please let me know if you have any leads on iOS apps with good library management and more than a basic equalizer!