Licenses & credits

LinZi builds on open language data and open-source components. These are the credits their licenses ask for; the same list lives in the repository (ATTRIBUTION.md) and inside the app under Stats → Settings → Licenses.

Vocabulary syllabi

  • HSK 3.0 word and character lists — 汉语水平等级标准 (2021), Ministry of Education, PRC. Parsed via ivankra/hsk30 (MIT-licensed repo). The syllabus itself is a government standard.
  • TOCFL 华语八千词 — Ministry of Education, Taiwan (tocfl.edu.tw). Parsed via ivankra/tocfl (MIT-licensed repo) and the official 2024-09 spreadsheet.
  • MOE 常用国字标准字体表 — Taiwan MOE common-character table (4808 characters).

Dictionaries & language data

  • CC-CEDICT — © MDBG / CC-CEDICT project, cc-cedict.org, licensed CC BY-SA 4.0. Changes made: senses are curated for learners (variant/see/archaeology senses demoted, romanization brackets stripped, plain-language glosses lead). The derived word data is distributed under the same CC BY-SA 4.0 terms.
  • Make Me a Hanzi — stroke-order geometry and character decomposition, skishore/makemeahanzi, licensed CC BY-SA 4.0. Used for stroke diagrams, writing practice and etymology panels.

Example sentences

  • Tatoeba — the Tatoeba project and its contributors, tatoeba.org, licensed CC BY 2.0 FR. Changes made: sentences are filtered, ranked for learner level and tokenized; translations paired via Tatoeba's link graph.

Stories

The graded corpus combines public-domain classical texts (chengyu, folktales, poetry, primers, classics) with original learner texts written for LinZi, each with paragraph-aligned English. Sources are attributed inline on each story.

Pronunciation audio

Generated with Microsoft Edge neural voices (zh-CN-XiaoxiaoNeural, zh-TW-HsiaoChenNeural) via edge-tts. Class/teacher audio additionally uses Cloudflare Workers AI MeloTTS.

Fonts

  • Noto Serif CJK / Noto Sans CJK (Source Han) — SIL Open Font License 1.1, subset to the app's glyph coverage.
  • LXGW WenKai (霞鹜文楷) — SIL Open Font License 1.1.
  • Inter — SIL Open Font License 1.1.

Software libraries

Runtime dependencies are declared in app/pubspec.yaml, site/package.json and requirements.txt. Vendored libraries: jszip (MIT), sql.js (MIT), hanzi-writer (MIT).