Amazon Kindle software lets you read ebooks on your Kindle, iPhone, iPad, PC, Mac, BlackBerry, and Android-based device. You can discover and read over 630,000 books in the Kindle Store, including the latest bestsellers and new releases. Amazon Whispersync automatically syncs your last page read, bookmarks, notes, and highlights across all of your devices, so you can pick up right where you left off no matter what device you are reading on.
- Calibre is a book manager. It manages books collection and books metadata. It's like a librarian. Amazon Kindle is a book reader with a basic book management (it manages the titles of the books one bought) .
- Calibre is a book manager and amazon kindle is an ebook reader software, it doesn't manage and convert the books on the other hand calibre let you manage, convert, edit and view the books.
- kindle app is a drm viewer Calibre is an organiser with viewer conversion and other open features