Credits and attributions
Last updated 6 October 2026
Inqui uses openly licensed data and open-source software. We are grateful to their authors. This page gives the attributions their licences require, for the website and for the Inqui mobile apps.
KanjiVG — stroke data for Japanese writing practice
The stroke order and stroke shapes used to practise writing hiragana, katakana and kanji come from KanjiVG, copyright © 2009–2026 Ulrich Apel and contributors, licensed under the Creative Commons Attribution-ShareAlike 3.0 licence (CC BY-SA 3.0).
Changes: we sampled the stroke paths into point sequences, simplified them and normalised them to a unit square so that your handwriting can be compared with them. Combined characters (for example きゃ) are composed side by side.
KANJIDIC2 and JMdict — Japanese dictionary data
This app uses the KANJIDIC2 and JMdict dictionary files. These files are the property of the Electronic Dictionary Research and Development Group, and are used in conformance with the Group’s licence (CC BY-SA 4.0).
KANJIDIC2 provides the school grade, frequency, readings, stroke counts and radicals used to select and describe the kanji in our Japanese writing decks, and the meanings of some of them. JMdict was used to check the example words. We do not claim copyright in this material.
Software used on our servers
- kuromoji.js (Apache License 2.0), with its bundled IPADIC dictionary (IPADIC licence, © Nara Institute of Science and Technology), to add readings (furigana) to Japanese text.
- WanaKana (MIT License), to convert between kana and romaji.
Open-source software and fonts
The Inqui mobile apps are built with Flutter and many open-source packages. Their licence texts are listed in the app, on the Licences screen in Settings. The typefaces used by the website and the app (Plus Jakarta Sans and JetBrains Mono, among others) are licensed under the SIL Open Font License.
Something missing or wrong? Tell us at [email protected] and we will fix it. See also the Terms of Service.