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Attributions

OptimalChinese is built on work other people made and shared. This page credits it, as their licences require.

Dictionary and sentences

CC-CEDICT

The bulk of the dictionary — around 124,000 Chinese-English entries

Licensed under CC BY-SA 4.0. Merged with other sources, re-keyed by tone-sensitive reading, filtered, and re-ordered by sense. The dictionary data remains under CC BY-SA 4.0.

Tatoeba

33,662 human-written example sentences with their English translations

Licensed under CC BY 2.0 FR. Filtered to simplified-character sentences that have an English translation, and indexed by word.

jieba

Part-of-speech labels for the dictionary words outside the HSK lists

Licensed under MIT. Only the part-of-speech tag of each word in its dictionary file is used, and only for words no other source classifies. Copyright (c) 2013 Sun Junyi.

Typefaces

Geist

The interface typeface

Licensed under SIL Open Font License 1.1.

Noto Serif SC

The Chinese typeface

Licensed under SIL Open Font License 1.1.

Open-source software

The app is built with open-source software. Grouped by licence, because each group asks for the same thing:

MIT

Next.js · React · Tailwind CSS · Radix UI · shadcn/ui · Zustand · ts-fsrs · fsrs-rs-nodejs · wa-sqlite · supabase-js · stripe-node · jose · fflate · fzstd · pinyin-pro · Fastify · Zod · msedge-tts

ISC

Lucide

Apache 2.0

openai-node

Something missing?

If you think something belongs on this page and isn't here, write to contact@optimalchinese.com and it will be added.