Credits
The lessons, examples, meanings and translations are written for this app. These sources supply the data around them. The dictionary and kanji data derived from JMdict, KANJIDIC2 and wordfreq is shared under the same licence, CC BY-SA 4.0.
JMdict
By the Electronic Dictionary Research and Development Group (EDRDG), through the jmdict-simplified JSON builds (github.com/scriptin/jmdict-simplified). Licence: CC BY-SA 4.0.
The written forms, readings and parts of speech of the dictionary's words, which words are common, and a check on the meanings. The meanings themselves are written for this app.
KANJIDIC2
By the EDRDG. Licence: CC BY-SA 4.0.
Stroke counts, and a check on the kanji readings and the okurigana splits.
常用漢字表 (the official list of kanji for general use, 2010)
By the Agency for Cultural Affairs (文化庁), Japan. Licence: a government notice, outside copyright.
Which kanji and readings the app writes, and the readings on the kanji pages.
wordfreq
By Robyn Speer, from many corpora (its README lists them). Licence: data CC BY-SA 4.0, code Apache 2.0.
Word frequencies, to choose which words the dictionary adds beyond the lessons.
Shippori Mincho and Zen Kaku Gothic New
By FONTDASU, and Yoshimichi Ohira, through Google Fonts. Licence: SIL Open Font License 1.1.
The Japanese typefaces.
Quoted texts: the haiku in the reading view are by Matsuo Bashō and Kobayashi Issa, as printed in the Iwanami Bunko editions of their haiku. The topic-comment example 象は鼻が長い is Mikami Akira's (1960).