# Stemmy

> Stemmy is a free Chrome extension for people who read English online: it shows what a word means in the sentence they are reading, saves it with that sentence, and reviews it with spaced repetition. Facts below checked 23 October 2026 against extension version 1.4.0.

## Facts

- Stemmy is a free Chrome extension (https://chromewebstore.google.com/detail/stemmy-vocabulary-wallet/mcajkojclojhelolpcggbgmdkccedbmh) that shows what an English word means in the sentence you are reading, saves it to a Vocabulary Wallet with that sentence, and brings it back in short spaced-repetition reviews.
- Look up a word: select it and click the Stemmy button beside it, press Alt+Shift+D, or click the toolbar icon. The card leads with the meaning for that sentence; "More about this word" adds synonyms and WordDNA (roots and related words).
- Vocabulary Wallet: each saved word keeps its meaning, the source sentence and the page link; words are grouped into categories automatically; search and JSON export are built in.
- Reviews: FSRS spaced repetition. Each rating button shows when the word comes back; at most 20 new words are introduced per day. The toolbar icon shows how many words are due.
- Wallet Letters (optional): up to three due words by email, daily, every other day or weekly, with "I remembered" / "I forgot" links that update the schedule.
- Also: AI stories from saved words; X-Ray (right-click "Find hard words on this page"); optional Immersion button that places saved words into the page you are reading.
- Free to install. No paid plan is offered today. AI features need a free account (Google Sign-In or email). Each account gets 150 free AI uses in total, once; Ghost Card lookups and cloud voice draw on them. Once the included uses are spent, your wallet, reviews, the toolbar badge and export keep working, and looking up a word you already saved stays free; new AI meanings wait for a future allowance. Questions: hello@stemmy.app.
- Privacy: the wallet, reviews and settings are stored in the browser. For a meaning, the word and the sentence around it go to the AI provider; X-Ray and Immersion send page text only when started. Stemmy does not keep a list of pages visited and does not sell personal data. Policy: https://stemmy.app/privacy/
- Language: English meanings only; Stemmy does not translate. Platform: Google Chrome on desktop. Contact: hello@stemmy.app.

## Start here

- [How Stemmy works](https://stemmy.app/how-it-works/): A walk through Stemmy in Chrome: select a word, read the meaning for that sentence, save it with its context, review it when due, and answer by email.
- [Guides](https://stemmy.app/guides/): Guides to learning English words from what you read: meanings in context, root words, business English, exam vocabulary and spaced-repetition reviews.
- [Compare](https://stemmy.app/compare/): Stemmy next to Google Dictionary, Toucan, Readlang and Relingo: what each does when you meet a new word, free tiers and prices, with sources and dates.
- [About Stemmy](https://stemmy.app/about/): Who makes Stemmy, why it exists, how the extension is built, and how the figures and comparisons on this site are checked and dated.
- [Privacy policy](https://stemmy.app/privacy/): what stays in the browser, what is sent for a feature, and how to export or delete data.

## Guides

- [English words with meaning](https://stemmy.app/english-words-with-meaning/): See what an English word means in the sentence you are reading, not in a long list of dictionary senses, and keep it with the context that makes it stick.
- [Root words and etymology](https://stemmy.app/root-words-and-etymology/): Learn English words faster through their Latin and Greek roots: how roots combine, why etymology helps words stick, and how WordDNA shows them as you read.
- [Business English vocabulary](https://stemmy.app/business-english-vocabulary/): Build business English vocabulary from the reports, emails and articles you read at work: meanings in context, saved with the sentence, reviewed later.
- [English vocabulary app for Chrome](https://stemmy.app/english-vocabulary-app/): Stemmy is a free Chrome extension: see what a word means in your sentence, save it to a Vocabulary Wallet, and review it with spaced repetition.
- [Vocabulary flashcards from your reading](https://stemmy.app/vocabulary-flashcards/): Stemmy Reviews turn the words you save while reading into spaced-repetition flashcards, with the original sentence attached and no cards to type.
- [Business English words in emails](https://stemmy.app/business-english-words-in-emails/): Business English words that come up in work emails, each with an example sentence and its meaning in that sentence. Learn them where you meet them.
- [IELTS vocabulary from reading](https://stemmy.app/ielts-vocabulary-from-reading/): Build IELTS vocabulary from what you read: a method for choosing, saving and reviewing words, then a list of words drawn from reading passages.
- [GRE vocabulary from reading](https://stemmy.app/gre-vocabulary-from-reading/): Learn GRE vocabulary from real reading: how to pick, save and review words, then a word list with each word in the sentence that explains it.

## Comparisons

- [Stemmy vs Google Dictionary](https://stemmy.app/compare/google-dictionary/): Stemmy and Google Dictionary side by side: what each shows when you look up a word, what they save, limits and price, with sources and dates.
- [Stemmy vs Toucan](https://stemmy.app/compare/toucan/): Toucan swaps words on a page into the language you are learning; Stemmy explains English words in context. Features, limits and price, with sources.
- [Stemmy vs Readlang](https://stemmy.app/compare/readlang/): Readlang and Stemmy both help you learn words while reading. Free-tier limits, prices and features compared, with sources and an as-of date.
- [Stemmy vs Relingo](https://stemmy.app/compare/relingo/): Relingo highlights new words by level; Stemmy explains the word you choose in its sentence. Free-tier limits, features and price, with sources.
- [Chrome extensions to learn English vocabulary](https://stemmy.app/best-vocabulary-chrome-extensions/): Five Chrome extensions for learning English vocabulary while you read, compared on approach, free tier and price. Written by the maker of Stemmy.

## Blog

- [How to remember new English words while reading online](https://stemmy.app/blog/how-to-remember-new-english-words-while-reading-online/): A practical reading-to-recall routine: choose useful English words, save their context, test your memory, and use them naturally after you close the tab.
- [Why dictionary definitions don't stick](https://stemmy.app/blog/why-dictionary-definitions-dont-stick/): Looking a word up is not the same as learning it. Why bare definitions fade, and a reading-based habit that keeps the words you look up.
- [Roots that unlock English words](https://stemmy.app/blog/roots-that-unlock-english-words/): A starter list of Latin and Greek roots that open up whole families of English words, with examples and how to use them while you read.

## Optional

- [Full text of every page](https://stemmy.app/llms-full.txt)
- [Sitemap](https://stemmy.app/sitemap.xml)