Have you tried looking? There's LibraryThing and a couple others.
I don't think there's much value left on the table in the niche, though. Kindles have first-class Goodreads sync and even a Goodreads button in their global navbar. And Goodreads' competitors, for the few people who don't want to use Goodreads, already have a deep rut of incumbency.
Even you, who has supposed great issues with Goodreads, apparently wasn't bothered enough to even see if competitors existed all this time, much less before writing your comment. Doesn't bode well for the Goodreads' competitor market, lol.
I don't think there's much value left on the table in the niche, though. Kindles have first-class Goodreads sync and even a Goodreads button in their global navbar. And Goodreads' competitors, for the few people who don't want to use Goodreads, already have a deep rut of incumbency.
Even you, who has supposed great issues with Goodreads, apparently wasn't bothered enough to even see if competitors existed all this time, much less before writing your comment. Doesn't bode well for the Goodreads' competitor market, lol.