Readings, dictionary definitions, word types, and frequency labels are derived from the JMdict dictionary. Copyright © James William Breen and the Electronic Dictionary Research and Development Group (EDRDG). Used under Creative Commons Attribution-ShareAlike 4.0.
Our derivative selects 3,000 common entries, chooses a matching Japanese spelling and reading, shortens definitions to three glosses, and simplifies word type labels. We order familiar everyday words first, followed by dictionary frequency indicators. Stable dictionary entry IDs preserve review schedules. The source is refreshed monthly.
The derivative dictionary data is available under the same CC BY-SA 4.0 license: Download the vocabulary JSON. You may share and adapt it, including commercially, with attribution, an indication of changes, and the same license for your derivative. The JSON includes its source and update date.
Selected cards use OpenMoji illustrations by the OpenMoji contributors. The illustrations are used without modification under CC BY-SA 4.0. Original artwork and contributor credits are available in the OpenMoji repository. The illustrations depict a word’s everyday meaning and do not cover every dictionary sense.
Every card in the 3,000-word deck includes a Japanese example and an English translation. 2,625 sentence pairs come from the Tanaka Corpus and Tatoeba, matched using JMdict dictionary senses and indexed word forms. They are used under Creative Commons Attribution 2.0 France. Each sourced example links to both sentences and credits their contributors beside the card. The vocabulary JSON retains both sentence IDs and contributor names in example.source. Where an original contributor has no available username in the current export, credit is given to Tanaka Corpus / Tatoeba contributors.
The remaining 375 pairs, lesson examples, and study explanations are written for Kana Practice. Original sentence pairs in the vocabulary JSON are available under CC BY-SA 4.0. Sentence pairs attributed to Tatoeba retain their CC BY 2.0 FR license independently of the dictionary fields.
Built-in kana, word and example audio is generated through Microsoft Azure Speech. We do not reuse Tatoeba recordings.
All 92 basic kana illustrations are by Ikou, originally published for Memorizing the Hiragana and Memorizing the Katakana on Wikibooks and shared through Wikimedia Commons.
The 46 hiragana illustrations are dedicated to the public domain under CC0 1.0. The 46 katakana illustrations are available under CC BY-SA 3.0, with attribution to Ikou. Our locally hosted katakana copies retain that license. We converted the files to lossless WebP and removed metadata; the composition, colors and drawn kana strokes are retained. These image licenses apply separately from application code.
Every illustration links to its original file and license. The per-image source manifest includes the author, original download, source checksum and license for each file. Small and voiced kana refer to their base pictures; combinations show both base pictures. The accompanying shape explanations are written for Kana Practice. Use the Japanese recordings to learn pronunciation.
Application dependency notices: third-party notices.