FlashCards: CEFR English Vocabulary

English vocabulary learning app with flashcards, reading comprehension, and speaking practice.

Website: https://flashcard.coinbx.com/

Features

• 10,674 words from Oxford 5000, CEFR levels A1–C2
• Translations in Thai, Chinese, Spanish, French, Japanese, Korean
• Neural TTS (Piper) for natural English pronunciation — works offline
• Speaking practice with pronunciation scoring
• Adaptive Speaking Test — finds your CEFR level
• Reading mode — articles with vocabulary highlighting
• Custom articles — paste any English text, vocab auto-highlighted
• Freemium — 100 free attempts, one-time unlock

Screenshots

Vocabulary Data

This repo hosts the vocabulary and reading data used by the iOS app for auto-updates:

data/
├── version.json       # Current data version
├── vocabulary.json    # 10,674 words (Oxford 5000, CEFR A1–C2)
└── readings.json      # ~35 curated English articles

The app checks data/version.json on launch and downloads updates automatically.

Word Schema

{
  "id": 1,
  "word": "example",
  "pos": "noun",
  "level": "B1",
  "hint": "an instance used to illustrate",
  "ipa": "ɪɡˈzɑːmpəl",
  "cats": ["academic", "daily"],
  "synonyms": ["instance", "case"],
  "translations": {
    "th": "ตัวอย่าง",
    "zh": "例子",
    "es": "ejemplo",
    "fr": "exemple",
    "ja": "例",
    "ko": "예시"
  },
  "examples": [
    {
      "en": "This is an example sentence.",
      "translations": {
        "th": "นี่คือประโยคตัวอย่าง",
        "zh": "这是一个示例句子。"
      }
    }
  ]
}

CEFR Levels

Level	Description	Color
A1–A2	Beginner / Elementary	Green
B1–B2	Intermediate / Upper Intermediate	Orange
C1–C2	Advanced / Proficiency	Pink