Bookcreator is designed to steam line the book formating process, wher calibe is used more for format shifting book content x to y
For instance if you wher creating a book you would use Bookcreator for adding the Table of content, chapter, italics , tables, image insertions, etc...
In the background Bookcreator creates an HTML file and has calibe convret the html to your target format such as epub, imp, mobi, etc ...
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