Third-party assets

Klee One handwriting font
Copyright 2020 The Klee Project Authors.
Source: https://github.com/fontworks-fonts/Klee
Font source: https://github.com/fontworks-fonts/Klee/blob/master/fonts/ttf/KleeOne-Regular.ttf
License: SIL Open Font License 1.1, retained in KleeOne-OFL.txt.
KleeOne-Kana.woff2 is a subset generated for this app with fontTools.
Changes: retains basic Latin, hiragana, Japanese punctuation and selected symbols;
converted to WOFF2. Font outline designs are unmodified.

KanjiVG stroke diagrams and sampled geometry
Copyright (C) 2009/2010/2011 Ulrich Apel and the KanjiVG project.
Source: https://kanjivg.tagaini.net/
Repository: https://github.com/KanjiVG/kanjivg
License: Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0).
https://creativecommons.org/licenses/by-sa/3.0/
Full license: KanjiVG-COPYING.txt
Unmodified source SVGs: kanjivg/ (74 sources: 46 basic, 25 voiced, 3 small hiragana).
Changes in ../kana-data.js: selected and ordered 104 learning items, extracted SVG
stroke paths, added romaji/row/set metadata and 40 equidistant sampled points per
stroke for drawing feedback. Basic/voiced source paths use the original 109 x 109
viewBox and stroke order. The 33 combinations compose a base with a small kana;
small-kana paths have transform translate(105 35) scale(.65), giving a 180 x 109
viewBox. Sampled points reflect the same affine transform. Source stroke path
coordinates are unmodified. The derived geometry remains CC BY-SA 3.0.

Pronunciation uses browser speech synthesis when a Japanese voice is available.
No recorded pronunciation clips are bundled.