I recently started using https://www.thestorygraph.com/ — it's for keeping track of your own reading, and they're promoting their own reco algorithm. Also, there's a paid plan with extra features.
It's early days, but it's neat and clean and it feels the opposite of Goodreads' everything-for-everyone-at-once-all-the-time approach.
From what I've seen of their recommendation algorithm, it's actually better that Goodreads's as well. The only issue being it seems to aggregate what you put in as your mood and preferences as well as what you've read, whereas on Goodreads you can filter by 'shelf' (which is usually horrible, but a feature I'd love to have on StoryGraph)
It's early days, but it's neat and clean and it feels the opposite of Goodreads' everything-for-everyone-at-once-all-the-time approach.