This plugin is intended to help you identify covers or book metadata that may need editing in your library that the normal calibre search criteria cannot identify, or is more conveniently accessible. It also offers a battery of ePub quality checks to help you identify ePubs that may warrant further attention to remove cruft files, reconvert etc. You can also search across your ePubs for ad hoc criteria to find text or specifically named items using regular expressions.
For more information, see the Wiki
All kiwidude's calibre plugins are now developed and maintained in GitHub at:
Please see the README.md and CONTRIBUTING.md at the above site for more information.