One of the best self-hosted app I've seen yet.
Metadata management is great. The best feature is getting the chapter from audible TOC with start/end times. So you'll get a way to navigate the books you've downloaded and not seek in a giant mp3/m4b files.
They are also alternatives to the official android client. The most annoying feature is that locally downloaded book crash the app. So now it's only streaming.
However there are alternative android and iOS apps: https://www.audiobookshelf.org/faq/app#are-there-any-3rd-par...
For iOS the best I've found is:
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