Credits & Acknowledgments
Jikakugo is built on the work of several open-source and open-data projects. We're grateful to their creators and maintainers — this page exists so you always know where the data and tools behind the app come from.
Kanji stroke order data
KanjiVG
The stroke order paths shown throughout Jikakugo's kanji writing practice are built from KanjiVG data. KanjiVG is released under the Creative Commons Attribution-Share Alike 3.0 license.
This means the underlying stroke data remains available to anyone under the same license terms, even though Jikakugo's own lesson content, explanations, and app code are not. If you build something with kanji stroke data yourself, KanjiVG is very likely the best place to start.
Fonts
Noto Sans JP, DM Sans, DM Mono
Jikakugo's Japanese and Latin text is set in Noto Sans JP (Google, in support of the Noto project), DM Sans, and DM Mono (Colophon Foundry / Google Fonts). All three are free and open under the SIL Open Font License.
Icons
Tabler Icons
Many of the interface icons throughout Jikakugo come from Tabler Icons, an open-source icon set released under the MIT License.
A note on Japanese language content
Japanese itself — every kana, kanji, word, and grammar pattern taught in Jikakugo — belongs to no one. It's a living language shared by everyone who speaks it. What is original to Jikakugo, and protected under our own copyright, is the specific way we've chosen to teach it: the lesson sequencing, example sentences, mnemonic hints, and explanations you read in the app. See our Terms of Use for the full picture.
Something missing?
If you believe something in Jikakugo should be credited here and isn't, please tell us on our feedback page — we'll fix it promptly.