Stemmy - Vocabulary Wallet

Tracking since Apr 1, 2026.

Changelog

• May 19, 2026
  description

  Stemmy is a free AI vocabulary builder that turns any webpage into a classroom. Highlight any word for an instant definition with etymology, pronunciation, and examples — then save it to your personal wallet and master it with spaced repetition.
  
  🔮 Ghost Card — Floating overlay with definition, pronunciation, synonyms, antonyms, and etymology. Works on every website. (Ctrl+E)
  
  🧬 Word DNA — Root morpheme, origin language, and related words from the same word family.
  
  💎 Vocabulary Wallet — One-click save. Searchable, sortable, organized by mastery level.
  
  🧠 Spaced Repetition — SM-2 algorithm schedules reviews at optimal intervals for long-term retention.
  
  📍 Encounter Tracking — Detects your saved words on any webpage you browse for passive reinforcement.
  
  📖 AI Stories — Generates short stories using your saved vocabulary for context-rich learning.
  
  🔬 X-Ray Mode — Scans any page and highlights complex vocabulary. Hover to review instantly.
  
  📊 Dashboard — Streaks, activity timeline, detailed word cards, data export/import.
  
  🔑 Free — 10 AI lookups included. Add your own Mistral API key for unlimited usage.
  
  🔒 Private — All data stored locally in your browser. Nothing collected or shared.
  
  🎯 Built for GRE, SAT, TOEFL, IELTS prep · ESL/EFL learners · researchers · writers · avid readers
  
  Install Stemmy — free, private, works on every website.

  Stemmy is a vocabulary builder that turns any webpage into a classroom. Highlight any word for an instant definition with etymology, pronunciation, and examples — then save it to your personal wallet and master it with spaced repetition.
  
  ✨ Key Features for Rapid Vocabulary Growth
  
  📖 Instant Definitions: Highlight any word for a floating "Ghost Card" overlay with definition, pronunciation, synonyms, antonyms, and etymology. (Ctrl+E)
  
  🧬 Word DNA: Explore root morphemes, origin languages, and related word families for deeper understanding.
  
  👛 Vocabulary Wallet: One-click save to a searchable, sortable wallet, organized by mastery level.
  
  🧠 Spaced Repetition (SM-2): Optimize long-term retention with a scientifically proven review algorithm.
  
  🔍 Encounter Tracking: Passive reinforcement by detecting your saved words on any webpage you browse.
  
  📚 AI Stories: Generate context-rich short stories using your saved vocabulary for engaging learning.
  
  ⚡ X-Ray Mode: Instantly scan and highlight complex vocabulary on any page for quick review.
  
  📊 Dashboard: Track progress, streaks, and manage your word cards with detailed analytics.
  
  🤖 Telegram Bot Integration: Extend your learning beyond the browser. Look up words and review your vocabulary directly from Telegram.
  
  While Ghost Card is a universal tool for anybody looking to expand their linguistic horizons, it is particularly effective for:
  
  🎓 Test Prep: Master high-level vocabulary for the GRE, SAT, TOEFL, and IELTS.
  
  🌍 Language Learners: Perfect for ESL/EFL students seeking rapid English acquisition.
  
  ✍️ Professionals: Ideal for researchers, writers, and avid readers looking to sharpen their lexicon.
  
  💸 Free & Flexible: Get 10 AI lookups free. For unlimited access, simply add your own Mistral API key.
  
  🛡️ 100% Private: Your data stays yours. All information is stored locally in your browser; there is no data collection, sharing, or transmission.

• May 19, 2026
  permissions

  sidePanel, contextMenus, storage, activeTab

  sidePanel, contextMenus, storage, activeTab, tabs

Permissions & access

Permissions

sidePanelcontextMenusstorageactiveTabtabs

Host access

<all_urls>

Screenshots

Similar extensions

Alternatives to Stemmy - Vocabulary Wallet, ranked by description similarity.

WordHub – AI Dictionary & Vocabulary Builder

Look up any word while browsing. Get definition, pronunciation, etymology, AI explanations, and spaced repetition — all in one tool.

343

★ 4.3

Memo — Capture Words While Browsing

Highlight a word on any website, save it to Memo with one click. AI context, spaced repetition, your word collection.

3

★ 5.0

Captur

Turn your favorite YouTube videos, articles, and blogs into systematic vocabulary learning. Click to save as flashcard.

12

★ 5.0

Word Highlighter - Vocabulary Builder

Highlight your vocabulary words on any webpage. Track word frequency, manage mastered words, and build your vocabulary effortlessly.

5

★ 5.0

Flashie: Anki Card Generator

Generate editable Anki cards from web pages

30

★ 5.0

Clutio - AI Vocabulary Builder

Click any word → AI explains meaning, context & nuance. Auto-generates flashcards & quizzes. Free with Groq AI. 100% private.

22

★ 5.0

WordTap: Instant Word Meanings & Synonyms

Highlight any word or phrase to get its meaning, synonyms, and examples instantly. Build your vocabulary as you browse.

49

★ 5.0

Memomizer - Quick Add

Instantly add words to your Memomizer vocabulary from any webpage with AI-generated personalized examples

5