I'm still on Goodreads but it's so slow, the app's just an even slower webview of the site and the redesign has made me have to click more to do what I want.
What's the alternative? Obviously we're on the fediverse and I see people talking about Bookwyrm.
I used Anobii till 2010 and I can't remember why I left but it's still there. I've poked StoryGraph a bit but it was lacking several of the books I wanted to add.
I use the strictly offline Book Tracker app on my iPhone. I don’t really care about reviews or the social features, I just want an overview and some stats about my reading.