Attributions
KanaMastery's Japanese content is built on these openly licensed sources. Thank you to everyone who maintains them.
JMdict
By the Electronic Dictionary Research and Development Group (EDRDG).
Readings and meanings of vocabulary, the example words on the kana charts and kana pages, and the word lists on the JLPT and kanji pages, and the words, readings and meanings in the Japan quizzes (prefectures, countries, food and menus, signs, loanwords and where they come from). The kanji and word data on those pages is shared under the same licence.
KANJIDIC2
By the Electronic Dictionary Research and Development Group (EDRDG).
Kanji readings (on'yomi and kun'yomi), meanings, stroke counts, school grades, newspaper frequency and radical numbers, on the kanji pages and in the games.
Unicode Character Database
By the Unicode Consortium.
The English names of the radicals on the beginner radicals page (the Kangxi Radicals and CJK Radicals Supplement blocks).
License: Unicode License v3
JLPT vocabulary and kanji lists
By Jonathan Waller (tanos.co.uk).
Our JLPT N5–N1 word lists are based on these lists, and so are the kanji levels of the N4–N1 paths (their readings and meanings come from KANJIDIC2). The official JLPT has not published vocabulary or kanji lists since 2010, so all JLPT levels here are unofficial. The kanji pages show each kanji's level from these lists.
License: Creative Commons Attribution (CC BY)
Wiktionary
By Wiktionary contributors.
The kanji each hiragana and katakana character developed from.
Wiktionary, Appendix: Japanese counters
By Wiktionary contributors.
The readings of counter words JMdict doesn't list (二匹, 三杯, 五冊…), checked against the regular sound changes.
Wikipedia, Honorific speech in Japanese
By Wikipedia contributors.
The table of special honorific and humble verbs (いらっしゃる, 召し上がる, 参る…) behind the N4 keigo drills. Every pair was checked against JMdict's honorific and humble labels, then reviewed.
Tatoeba
By Tatoeba contributors (tatoeba.org).
The example sentences of the N5 sentences path, with their English translations and word index (the readings are checked against JMdict). Each sentence was reviewed before use. A kanji page shows one of these sentences when it has the kanji, linked to the sentence on Tatoeba.
KanjiVG
By Ulrich Apel and the KanjiVG contributors.
Stroke order for every kana and kanji we teach (release r20250816). The stroke files we derive from it are available under the same licence.
Kenney game audio
By Kenney Vleugels (kenney.nl).
The games' sound effects (when you turn them on in Settings): from the Interface Sounds, Digital Audio and Music Jingles packs, with their loudness evened out. Credit isn't required; we give it anyway.
Wikidata
By the Wikidata community (Wikimedia Foundation).
The list of the world's countries and their Japanese names, which the Countries in Japanese quiz checks against JMdict.
JMnedict
By the Electronic Dictionary Research and Development Group (EDRDG).
The katakana spellings in the “your name in Japanese” tool; the readings of anime and manga titles, and a check on the Yamanote Line station readings, in the Japan quizzes.
Wikipedia
By Wikipedia contributors (Japanese and English Wikipedia).
In the Japan quizzes: the official titles of anime and manga, their English titles and popularity (page views), readings JMnedict doesn't have, the Yamanote Line's stations and their readings, and facts behind the trivia questions.
License: Creative Commons Attribution-ShareAlike 4.0 (text); we use facts: titles, names, readings
Natural Earth
By Natural Earth (naturalearthdata.com).
The map of Japan's prefectures in the Japan quizzes (1:10m states and provinces), simplified and drawn as Japan holds: the Northern Territories as part of Hokkaidō, Takeshima as part of Shimane, the Senkaku Islands as part of Okinawa. We also moved the Amami islands into Kagoshima.
License: Public domain
UN M49
By the United Nations Statistics Division.
The region each country belongs to in the Countries in Japanese quiz.
License: United Nations standard (country codes and regions)
Software and fonts
ts-fsrs by the Open Spaced Repetition project (MIT): The FSRS scheduler behind Smart Review.
WanaKana by WaniKani (MIT): Turning romaji into kana as you type.
kamiya-codec by Ahmed Fasih (Unlicense (public domain)): Verb and adjective forms for the conjugation and keigo drills, after Taeko Kamiya's handbooks.
Mochiy Pop One, Archivo, M PLUS Rounded 1c by FONTDASU, Omnibus-Type, and Coji Morishita and the M+ Fonts Project, via Google Fonts (SIL Open Font License 1.1): The site's typefaces: Mochiy Pop One for titles, Archivo for the interface, and M PLUS Rounded 1c for Japanese.
Zen Kurenaido, Klee One, Yuji Syuku by their designers, via Google Fonts (SIL Open Font License 1.1): The handwriting, textbook and brush typefaces in the kana practice stages.
Reusing our word and kanji data
Because JMdict, KANJIDIC2, Wiktionary and Wikipedia are ShareAlike licensed, the vocabulary, counter, keigo, kanji and kana chart data derived from them is available under the same license, Creative Commons Attribution-ShareAlike 4.0. This does not cover the rest of KanaMastery (the site, its design, audio or other content).