Sources
Every meaning, reading, stroke and sentence on the site was made by somebody else first. These are the sources, what we keep from each, and when it last came in.
- WaniKaniThe kanji-learning service whose curriculum a member studies through. Its catalogue of subjects is synced into ours; a member's own progress is read live from their account.491 radicalslast brought in 2 months ago
- KANJIDIC2The Electronic Dictionary Research and Development Group's kanji dictionary: every character with every meaning and reading, built into the site as a file.10,384 characterslast brought in 3 days ago
- RADKFILEMichael Raine's analysis of which elements every JIS kanji is built from, maintained by the EDRDG. It is what the radical lookup in the search box asks: pick the parts you can see, get the characters that hold all of them.253 classical radicalslast brought in not recorded
- KanjiVGUlrich Apel's stroke-order project: each character as the strokes a hand makes, in order, which is what the stroke animations draw.2,919 characters with stroke orderlast brought in not recorded
- kanjiapi.devA public API over the EDRDG dictionaries, used once per character to enrich the JLPT table with compounds and keywords.2,211 characterslast brought in 5 months ago
- TatoebaA collaborative corpus of sentences and their translations, contributed by volunteers. The example sentences on every subject page are theirs.232,731 sentenceslast brought in 3 days ago
- JMdictThe Electronic Dictionary Research and Development Group's Japanese-English dictionary. We take none of its definitions — only the frequency tags it carries, which say how common a word is in a newspaper corpus.6,204 words with a frequency bandlast brought in today
- JitenAn open project that counts how often words appear across 16,232 works of Japanese media, and publishes a frequency list for each medium. It answers what a newspaper corpus cannot: what people actually say.11 media corporalast brought in today
- MEXT and the Agency for Cultural AffairsJapan's official kanji tables: the elementary and secondary curricula from the Ministry of Education, the joyo list and the name-kanji list from the Agency for Cultural Affairs.1,026 elementary school kanjilast brought in 5 days ago
- Global Map Japan (GSI)The Geospatial Information Authority of Japan's Global Map, which is where the 47 prefecture outlines come from. The shapes on the board are theirs; the projection, the simplification and Okinawa's box are ours.47 regions drawnlast brought in 5 days ago
- U.S. Census BureauThe Census Bureau's cartographic state boundaries, reaching us as TopoJSON through Mike Bostock's us-atlas. Neighbouring states share arcs in that format, which is how the game knows whose border touches whose.51 regions drawnlast brought in 5 days ago
- Natural EarthNatural Earth's public-domain cultural vector dataset, which is where our Canada and world regional maps come from. While the United States uses Census TopoJSON and Japan uses GSI Global Map data, Natural Earth provides the administrative division boundaries (states, provinces, prefectures, and territories) for Canada, our admin pilot countries (Thailand, China, Australia, and Taiwan), and 25 additional global countries in our world map library. Their Populated Places dataset supplies the cities every one of our maps can draw, Japan's and the United States' included - those two keep their own outlines and take only the city points. Neighbours are worked out from shared boundary points rather than predefined topology.1,244 regions drawnlast brought in today