Hey hudibras,
I'm Andrew, author of the Kanji Learner's Course. I just googled the book and stumbled across a friendly post you made last year about the book - thanks for the kind words! It's always nice to hear that the course is helping someone achieve their goals. Perhaps because it was an old thread I could not reply to it, so with apologies I'm replying here in this unrelated thread.
I wanted to let you know that we're working on an app that will be a big improvement on the book. If you're interested, just email andrewscottconning at gmail to let me know whether you prefer Android or iOS, and I will make sure you get a free download just as soon as the app is ready. If you might even be willing to be a beta tester, that would be fantastic. But if you would rather not, I completely understand of course.
Either way, I hope I can connect with you by email and be able to share news moving forward. If there's any way I can support your studies, it's always my pleasure to help.
Very best, Andrew