The best alternatives to bookpo.st are Reading This, BingeBooks, and iChatBook. If these 3 options don't work for you, we've listed a few more alternatives below.
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Reading This lets you make a top five list of your current reading recommendations and share that list via a link. Reading This also has a page where you can see the recommendations that other users are making.
Use BingeBooks to find your next favorite book. Read opening chapters of best-sellers. Browse intriguing subgenres. Save favorite authors to your private stash. Listen to audio snippets. Buy books from your favorite retailer.
iChatBook lets you chat with your books. Existing book apps that have launched on PH don't have knowledge of the book contents. Other apps that let you chat with your files, don't make it easy to chat with books.
Bookey is an app that lets you meet new people in your community through book swaps. It uses a magical algorithm to match you with people who are local to you. A match occurs if you like someone's book and they like one of yours.