There are several book review apps available for book lovers to explore and discover new titles. Some popular book review apps include:
1. Goodreads: Goodreads is a social networking platform for book lovers that allows users to rate and review books, as well as connect with other readers and authors. The app also provides personalized book recommendations based on a user's reading history.
2. Bookly: Bookly is a reading tracker and book review app that helps users keep track of their reading progress and share reviews with other readers. The app also offers reading challenges and personalized book recommendations.
3. Litsy: Litsy is a social networking app for book lovers that allows users to share book reviews, quotes, and recommendations with other readers. The app also features book clubs and reading challenges to help users discover new books.
4. Book Riot: Book Riot is a book review app that offers book recommendations, reviews, and author interviews for readers of all genres. The app also features curated book lists and reading challenges to help users discover new books.
Overall, book review apps are a great way for book lovers to connect with other readers, discover new titles, and share their thoughts on the books they've read. Whether you're looking for personalized book recommendations or simply want to connect with other book lovers, there's a book review app out there for you.