Vocabulary Builder

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.

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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.

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PRIVACY

No account required

No tracking

No analytics

Your data never leaves your device

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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.