Vocabulary Highlighter — Learn Words While You Read

Highlight unknown words on any website. 12 languages. Flashcards, spaced repetition, word frequency. No account needed.

Learn vocabulary in 12 languages by reading websites you already love — Reddit, Medium, news, documentation, anything. HOW IT WORKS Open any webpage → click "Activate" → every word gets color-coded. Green = you know it. Red = you don't. Click an unknown word, press Enter — it's added to your dictionary. The extension remembers. Over time, you see fewer red words. That's your progress. MULTI-LANGUAGE SUPPORT (NEW in 0.3.0) Learn English, Spanish, French, German, Italian, Portuguese, Russian, Turkish, Arabic, Hindi, Japanese, or Korean. Switch languages instantly from the popup — each language has its own dictionary, stats, and flashcard deck. Translations powered by MyMemory API with Google Translate fallback. FLASHCARDS WITH SPACED REPETITION Unknown words you encounter while reading automatically become flashcards. Practice them with a 3-button rating system (Don't know / Kinda know / Know it). The built-in spaced repetition algorithm schedules reviews at optimal intervals so you remember words long-term. WORD FREQUENCY TRACKING See which unknown words appear most often across everything you read. Filter by time period: days, weeks, months, or years. Focus on high-frequency words first — they give you the biggest reading comprehension boost. QUICK SETUP QUIZ Mark common words you already know in batches of 150. Available for English (1,500 words), Spanish, French, German, Italian, and Russian (1,500 words each). Takes a few minutes. After that, the extension only highlights words you actually need to learn. CLICK-TO-TRANSLATE Click any word to instantly see its translation or definition. English words get dictionary definitions; other languages get translations to your native language. Google Translate link as fallback. FEATURES - 12 languages with instant switching - Color-coded word highlighting on any website - Flashcards with spaced repetition (SM-2 algorithm) - Top unknown words ranked by frequency - Inline translations and definitions - Quick setup quiz (1,500 words per language) - Customizable highlight colors - Import/export word lists (CSV) - Reading streaks and daily stats - Cross-device dictionary sync via Chrome - Smart script detection (Japanese doesn't highlight English text, etc.) PRIVACY No account. No cloud servers. Your dictionary syncs through your Chrome profile — only you can see it. Word lookups use free translation APIs. All highlighting happens in your browser. WHO THIS IS FOR Language learners (intermediate+) who want to build vocabulary from real content instead of textbook word lists. Works best when you read every day — articles, Reddit threads, documentation, blogs. WHAT'S NEW IN 0.3.0 - 12 language support with per-language dictionaries - Instant language switching from popup - Vocabulary quiz for 6 languages (1,500 words each) - Translations via MyMemory API + Google Translate fallback - "Translate to" setting — choose your native language - Smart script filtering (only highlights target language) - Redesigned settings with sticky language bar - Usage dashboard with days/weeks/months/years view