Stack.app is described as 'Record your reads, create digital book stacks and explore other users' picks' and is an website in the News & Books category. There are more than 25 alternatives to Stack.app, not only websites but also apps for a variety of platforms, including Android, iPhone, iPad and Mac. The best alternative is Goodreads, which is free. Other great sites and apps similar to Stack.app are Open Library (Free, Open Source), LibraryThing (Free), lib.reviews (Free, Open Source) and What Should I Read Next? (Freemium).
A reading platform The best reading experience available on any computer, tablet, and smartphone. Read anywhere, anytime, online or offline. Personalize your settings, follow your progress, archive your highlights and notes automatically: Glose is the ultimate reading hub.
BookWorm is an Android application that allows you to keep track of books you have read and those you intend to read. It is not a book reader. You can enter books by scanning them (product codes), searching for them, or direct form entry. You can rate and comment on each book.