It acts as a self hosted "personal Goodreads" because I became tired of switching providers every time an online service was shut.
You have control on your data since Jelu offers an API you can script or integrate with any third party tool or service (which you cannot do with the vast majority of other online services).
For example if you want the database to be located next to the jar file (instead of being located in the default ${user.home}/.jelu/database/ folder) :
The automatic metadata online search is provided for the moment through a calibre tool called fetch-ebook-metadata (whether you like it or not).
The docker image we provide embeds the fetch-ebook-metadata executable to automatically import books based on their title, authors or isbn.