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I would love this too. Calibre is amazingly useful and powerful, there’s nothing else like it, but my goodness the UI is ugly.

I’ve come to appreciate it as some sort of outsider art anti-design, defiantly refusing to follow any notion of design consistency and aesthetics. But still, a nicely designed version would be amazing.

Would you mind listing some of the killer Calibre features you'd expect to see in an MVP?

Cover grid, virtual libraries, customizable details pane (select the fields to show), filtering (both tree and search), virtual libraries (collection), export template, metadata editing and embedding (write to file).

Thats the few stuff I used regularly.

Not the OP, but my library management is 90% tagging, format conversion, metadata fetch and editing, and format tune-up (font subsetting or stripping fonts, fixing covers, etc.). Virtual libraries keep me organized based on tags.

Hey, which program do you do that now with, Calibre or a set of separate tools?

Calibre.

How do you feel about the built-in Apple Books?