Good question! My main use for Calibre has been to collect my epubs (mostly) in one place, and occasionally sync them to my ereader. When I add books, I need to grab metadata for the book like title, ISBN, etc.

Citadel will (and does) support editing metadata for books — titles, authors, (in future) tags, custom columns. That’s certain. Syncing to devices will come too, in time, as will downloading metadata from online sources.

But what I don’t plan on adding is a way to edit book content or an embedded ereader. There are lots of great ereader apps & devices already, and I don’t think epub editing is commonly used (compared to keeping a collection).

While I don’t have a road map, I’m always open to feedback and ideas!

(Edit: other features like format conversion and stripping DRM are likely to happen too. Ideally with crates or plugins, to make it a bit easier to extend)