Vocabulary Builder

Learn vocabulary with flashcards, spaced repetition, and context menu lookup

Vocabulary Builder — Learn Words Effortlessly Build vocabulary with smart flashcards, spaced repetition (SM-2), and instant word lookup. Translate across 12+ languages — fast, accurate, and distraction-free. ──────────────────────────────── FEATURES Instant Word Lookup Right-click any word to see its definition and translation instantly. Multi-Language Support Vietnamese · Chinese · Japanese · Korean · Spanish · French German · Portuguese · Russian · Thai · Indonesian · Arabic AI-Powered Translation (Optional) Advanced translation powered by configurable AI services. Bring your own API key and choose the model that fits your needs. Smart Learning Flashcards powered by the SM-2 spaced repetition algorithm to improve long-term retention. Text Highlighting Highlight text on any webpage using multiple colors for better focus and organization. PDF Word Lookup Look up words directly inside PDF files via the Chrome side panel. Audio Pronunciation Natural-sounding pronunciation for supported languages. Gamification Streaks, XP, levels, and progress tracking to keep you motivated. Power User Tools Keyboard shortcuts for faster and more efficient workflows. Study Reminders Configurable notifications to help build a consistent learning habit. Offline-First All vocabulary data is stored locally on your device and works offline. Data Control Export and import your vocabulary anytime. ──────────────────────────────── PRIVACY No account required No tracking No analytics Your data never leaves your device ──────────────────────────────── FREE TO USE Core features work without any API key. Optional AI translation requires your own API key. You stay in full control of providers and costs.