I don't think you understand what Calibre Companion actually does. It's not a replacement for Calibre on your Mac; it's a companion for Calibre (hence the name) which you install on your Android device, and which then synchronises with your main Calibre library. You can then do library browsing, searching, etc (all offline) on your tablet, and once you've found a book which interests you, open it in your chosen reading app. It's a wonderful tool. Do take a look at it.
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