Having used BookWyrm and NeoDB, it's definitely very comparable to GoodReads vs IMDB, at least in terms of interface/user experience/aesthetics/etc. BookWyrm being specifically for books, it has a ton of fields that wouldn't be applicable to anything else, i.e. "publisher", " ISBN". It can pull data automatically from some outside book databases. NeoDB seems able to do that same thing, except for any kind of media. Not sure where all they're pulling the data from. They also seem to have fields for just about anything, from tracklist to director to author.

[–] [email protected] 10 points 1 week ago

NeoDB has feature for exporting data from external database.

Here's the list:

IMDB
The Movie Database
Douban (Chinese film, books, music, recent events, and activities tracker)
Google Books
Discogs
Spotify
Apple Music
Bandcamp
Steam
IGDB
Bangumi (Chinese animation, comic, games, live action, and music database/tracker)
Board Game Geek
Archive of Our Own
any RSS link to a podcast