Does anyone else know of a good self hosted ebook library server that can be used with native multi-platform reading app support and sync reading progress?

I really don't want to read books from a web app, I want to be able to read while offline whether on my iPhone, iPad or my Boox e-reader (Android)

I love the way BookFusion works, but I don't want to rely on their cloud storage (or any company's cloud storage for that matter)
#FOSS #SelfHosted #ebooks #nas #HomeLab