Just provide a path to the library (http https or ftp) and you are ready to go! Search on Title author tag or description. Search google for that book in the same app fully automatic, no switching apps. Click on tags to search for them. Define your sorting (new books first). Search books, look in author title description or all. List results and download the book into your reader app. No tinkering with iTunes. Put the calibre library anywhere. Your pc, a website, or a NAS. Make sure you have http or ftp access and you are ready.