Sources and Licenses

Yubigaki is built on open data. Thank you to everyone who made it. The licenses below cover only this data, not the app's code, design or icon (© Patryk Skibniewski). The App Store terms do not restrict your rights to this data. You can download all of it.

Kanji and words

This app uses the JMdict/EDICT and KANJIDIC 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).

JMdict-EDICT Dictionary Project · KANJIDIC Project · EDRDG licence

Used: kanji meanings, readings, school grades and frequency (KANJIDIC2); words, their readings and English meanings (JMdict). Selected and shortened. The data version is listed on the data page.

Polish meanings

Polish translation of the KANJIDIC2 and JMdict meanings by Patryk Skibniewski, licensed under CC BY-SA 4.0. The translations were checked against Wikisłownik, Tatoeba and JMdict meanings in other languages; the record of that check is part of the data download. The Tatoeba sentences quoted in it (CC BY 2.0 FR) are credited there to their authors.

Strokes and parts

KanjiVG © Ulrich Apel, licensed under CC BY-SA 3.0.

Changed: the SVG stroke paths were converted to polylines, and each kanji's parts with their stroke ranges, its components and related kanji were added. The changed data is licensed under CC BY-SA 4.0.

Where characters come from

The "Glyph origin" sections of the English Wiktionary, written by Wiktionary contributors, licensed under CC BY-SA 4.0. The texts were shortened. Each one comes from the Wiktionary entry for its character.

JLPT levels (unofficial)

Lists N5 to N1 by Jonathan Waller, tanos.co.uk, Creative Commons BY. Files from Kanji Dojo Data, CC BY 4.0. The JLPT does not publish official kanji lists.

Review scheduling

Reviews are scheduled with the FSRS algorithm, following py-fsrs by Open Spaced Repetition, MIT License.

No warranty

The data is provided as is, without any warranty of correctness, as its licenses say. If you find a mistake, please write to support@yubigaki.com.