Kanji-Kounter is a Python tool that checks EPUB files and gives the user information about Kanji-frequency, the total amound of Kanji and the number of unique Kanji in the file. It's for Japanese learners that want to figure out how hard a book is before diving into it
In some cases, you might also need to install tkinter. On most systems, tkinter is included in the standard library.
If you don't have python or don't want to bother with the terminal, just run the .exe
Windows sometimes falsely detects the .exe as a virus, even tho it's safe, you can check the source-code if you're a bit paranoid :)