Find in calil is a free Chrome add-on that streamlines the process of searching for books by ISBN on the Calil website. Users can easily select any string of text on a webpage and right-click to initiate a search by choosing the "Search with selected ISBN in Calil" option. This feature enhances the browsing experience by allowing quick access to ISBN-related information without needing to manually input the data.

Additionally, for Amazon book pages, users can right-click and select "Calil ISBN Search," which automatically detects and retrieves the ISBN without requiring any text selection. This functionality simplifies the search process, making it efficient for users looking to gather information about books, although it currently does not support eBooks.