Can I use Book Collector to also record reading levels such as Lexile?
Yes, Book Collector can keep track of the reading level information for your books. Reading level information is not available from the online sources, so you will have to enter the levels in manually. Use the menu Edit | Edit Book, and on the “personal” tab enter the reading level in for example the field “tags”. After entering the reading level, you can use the menu View | Folders | Tags to group the books on reading level.