Some additional statistics:
Inspired by and can accompany James Heisig's Remembering the Kanji, vol. 1 and vol. 3 books or the Remembering the Kanji iOS app. English keywords copyrighted by James Heisig and University of Hawaiʻi Press. See Katsuo's multi-edition spreadsheet of kanji and Heisig keywords.
Kanjiwild's source code is in the public domain. Please file bug reports and feature requests at GitHub Issues.