

BookOrbit is doing pretty well for me so far with comics. Seems to have manga options about reverse reading direction.
Even better for books too. Can do koreader opds and email books as well. (I have a kobo so I haven’t tried the kindle-orientated email, but I assume it’s ez pz)
Very good metadata ingestion. And the book/comic libraries aren’t in different silo’d worlds like they are with Calibre and its derivatives.
I’m pretty pleased so far, have found some niggles but nothing bad. And the good stuff plenty outweighs anything else. It’s all ready to go, I switched libraries quickly. And it ate up my old library with its different (not as good) naming style and realigned it automatically, which was nice.

Indeed that was me in the other thread on book managers, so to be fair people aren’t raving about it - only I am haha!