Following up on my earlier post about the reading-vs-library-management trade-off — I ended up building something to try and bridge that gap myself.
It's called BookShelves, a native reader for macOS and iOS. EPUB, PDF, comics (CBZ/CBR/CB7), iCloud sync across devices, OPDS catalog browsing, and Calibre wireless server support so you can send books straight from your Calibre library without cables.
Free for up to 10 books, $2.99 one-time unlock for unlimited. No subscription.
I wrote up more detail in Self-Promotions:
https://www.mobileread.com/forums/sh...d.php?t=372622
Happy to answer questions — I've been around here long enough to know what this community actually cares about when it comes to EPUB rendering.