lemma · ˈlɛmə · n.
Every word on the web, reduced to its lemma — and tuned to what you know.
Read anything. lemmaro quietly highlights words by how well you know them, and turns one click into everything you need to actually learn them.
Free core · pre-launch · Chrome, Firefox, Brave
Language is the one tool we never set down. We thoughts into words, each phrase against the last, and meaning we could not hold in silence. Most of it happens notice — a , almost act. Yet every sentence you widens the world you can .
- context
- forms
- translations
- definitions
- collocations
- relations
- note
render
/ˈrɛn.dər/
sense · in context
to cause to become; to represent or depict
uk · відтворювати, зображати
synonyms
collocations
New to you — first time you've met it. Base form: render.
the loop
Read. Tap. It sticks.
Three steps, no separate study app. The page you're already reading becomes the lesson.
- step 01
Read, and watch the page sort itself
On any website, lemmaro highlights words by your mastery state — mint for known, lilac for learning, amber for new. You keep reading; the color does the noticing for you.
- step 02
Tap a word for the whole picture
One click opens its lemma, IPA, tap-to-play audio, part of speech, CEFR level, and senses in context — plus synonyms, collocations, and a plain answer to "why was this highlighted?"
- step 03
It comes back right before you'd forget
FSRS schedules each word into your review queue at the moment recall is about to slip, so a single tap turns into lasting memory instead of a note you never reopen.
on your device
It actually understands the words you read.
It knows "running", "ran", and "runs" are one word, and which meaning fits the sentence — the reading that decides what to highlight runs right on your device.
each word → its base form
read on your device
Every form, one word
"running", "ran", and "runs" all count as run — so your progress tracks the word, not the spelling.
base formKnows a noun from a verb
It reads each word in context, so "book a flight" and "read a book" are never mixed up.
part of speechSpots whole phrases
Phrasal verbs and set phrases are read as one idea — "give up," not two stray words. The parse runs on your device; the phrase patterns are confirmed against lemmaro's dictionary.
phrasesA higher-accuracy mode
Switch it on when you want the most precise reading — a deeper language model that still runs on your machine.
optionalAll on your device
The reading that decides what to highlight happens on your machine. To show a word's meaning, lemmaro looks it up by word — not your page.
on your deviceWorks on every site
It's ready once, then helps on everything you read — articles, docs, forums — without slowing the page down.
any page
inside the card
Everything you need to actually learn the word.
One click opens the whole anatomy of a word — every part is a real, named piece of the popover, not a marketing screenshot.
No tab-switching, no dictionary detour. The word, its sound, its senses, and the company it keeps — all in the place you were already reading.
- lemma · /ˈrʌn.ɪŋ/
Lemma + IPA
The base dictionary form, with IPA right beside it. Read "running" on the page, learn "run" — the form your brain files it under.
- tap to play
Tap-to-play audio
Tap the amber speaker to hear it spoken. Pronunciation lands faster from your ear than from a phonetic chart.
- part of speech
Part of speech
Noun, verb, adjective — worked out from context, not guessed. Knowing the part of speech tells you how the word behaves in a sentence.
- A1–C2
CEFR level
Every word carries its band, A1 through C2, so you instantly know whether it's foundational or a stretch.
- rank
Frequency rank
How common the word really is across real text. Spend your effort on words you'll meet again, not rare ones.
- senses
Senses, disambiguated
Multiple glosses, with the one that fits this sentence surfaced first. You learn the meaning in front of you, not all of them at once.
- compare
Synonyms + compare
Near-words at a glance, plus a side-by-side panel that lays two synonyms together so you feel the difference, not just the overlap.
- collocations
Collocations
The words this one actually travels with. Learning the pairings is how vocabulary turns into fluent phrasing.
- phrasal verbs
Phrasal verbs, grouped
"Run into," "run out," "run over" — gathered under their base verb so a whole family clicks into place together.
- examples
Example phrases
Short, real uses that show the word at work. Context is what makes a definition finally stick.
- explainer
Why was this highlighted?
A plain-language explainer for every highlight — your mastery state for this word, and why lemmaro flagged it now.
- customizable
Drag-to-reorder header
Pull the parts you care about to the top. The popover header is drag-and-drop, so it ends up shaped like the way you learn.
your words
Color-coded by what you already know.
Three states, tracked per word, painted onto every page you read.
The highlight isn't decoration — it's your status. lemmaro keeps a mastery state for every word you've met, and only paints the ones that earn your attention. Mark a word known and it goes quiet across the whole web; the new and learning words stay lit until they stick.
- Status is per word, not per page
- Each word carries its own state in your profile. Read anywhere and the same word reads the same way — known stays quiet, learning stays lit.
- You set the state
- Every popover lets you mark a word known, save it to start learning, or skip it. The highlighting on every other page updates to match.
- The legend you already know
- It's the same mint, lilac, and amber the app uses everywhere — so the color you read on the web is the color you act on in your Library and Review queue.
the same word, everywhere you read
- renderNew
Words you haven't met yet, surfaced in amber — the cue to look, save, and start learning. Amber always means do this.
- fluentLearning
Words in your active set, marked in lilac. They stay highlighted on every site until your reviews say they've landed.
- beneathKnown
Words you've mastered turn mint, then fade out of the highlighting entirely — so the page only ever shows you what's still worth your attention.
page vocabulary
Size up any page before you read it.
One keystroke shows how much of a page you already know — and pulls out the handful of words actually worth learning.
Hit the shortcut on any article and lemmaro reads the whole page at once: the share you already know, how it breaks down by CEFR level, and exactly which words are new. Decide it's a comfortable read — or that it's not worth your time — before you start.
Know your %, at a glance
“86% known · comfortable read” — an instant read on whether a page sits in your range.
Broken down by level
See the page's vocabulary spread across CEFR bands A1–C2, so you know if it's a real stretch.
Just the words to learn
New and in-progress words are pulled into their own list — or a word cloud — so you can learn them first or move on.
One keystroke, any site
Toggle the panel anywhere with a keyboard shortcut; it works on every page, right alongside the highlights.
pdfs, too
The same reading, now on your PDFs.
Switch on the in-app PDF reader and a PDF behaves like any web page — highlighted by what you know, one click to the full card.
Turn on the reader in Settings and lemmaro renders the file right in your browser, lays its highlights over the text, and runs the same lookup, mastery, and review loop you get on the web. Leave it off and your browser's own PDF reader takes over.
Opt-in, off by default
One switch in Settings lets lemmaro open PDF links in its own reader. Turn it off and your browser's native reader handles them.
Highlighted like any page
The full pipeline runs on the PDF's text — colored by mastery, the card one click away, every word you meet saved to your Library.
Faithful to the page
Renders the document the way it was laid out, with a selectable text layer, plus zoom and page navigation.
Still on your device
The PDF is rendered and read in your browser. As with any page, lemmaro looks up words — not your document.
spaced repetition
Surfaced at the exact moment you'd forget.
Every word you save comes back for review at just the right moment — powered by FSRS, a modern spaced-repetition algorithm.
lemmaro doesn't drill you on a fixed timetable. It models how each word's memory decays and schedules the next review for the day your recall is predicted to slip — so you study fewer words, later, and remember more of them.
FSRS predicts the dip and reviews each word just before it — the gaps grow as the word sticks.
- Review queue
A queue that knows the right day
The Review queue holds only the words actually due, ranked by when FSRS predicts you'd forget them. Nothing surfaces early just to pad a streak.
- Quiz panel
Grade it, and the interval adapts
The quiz panel asks how that word landed — forgot, hard, got it, easy — and FSRS reschedules from your answer. Each grade stretches or shortens the gap to the next one.
- Per-word state
Mastery tracked per word, over time
Every saved word carries its own state — new, learning, familiar, known — that shifts as you review. The same color you see highlighted on the page is the state the scheduler is working from.
- Passive review
Re-encounters do the reviewing for you
Keep reading, and a due word you meet again can quiz you right there in the popover — no separate session needed. Real reading is the spaced part.
library
Your words, saved and searchable.
Every word you click is kept. Not in the page you read it on — in a workspace that's yours.
Search your whole vocabulary
Type a lemma, a phrase, or a topic — find any saved word in the Library instantly, regardless of which page you first met it on.
Save phrases, not just words
Keep your own custom phrases alongside single words, so the collocations and expressions you actually want to learn don't slip through.
Notes that stay with the word
Attach a per-word note — a mnemonic, a translation that finally clicked, the sentence you found it in — and it's there every time the word resurfaces.
A workspace, not a popover
Saved words, phrases, and notes live in one personal dashboard that persists across sessions and devices — a durable place to study, not a moment that vanishes when you scroll.
- renderverb
render aid — heard on the news
- weighverb
weigh the options
- fluentadjective
- graspverb
grasp the concept
en ⇄ uk
English and Ukrainian, with room for more.
Learn English vocabulary with Ukrainian glosses out of the box, or switch on Improved Quality to read Ukrainian with English support.
Today, lemmaro covers one language pair. Everything underneath it — how it reads words, ranks meanings, and tracks what you know — works the same in any language, so adding the next pair is a matter of data, not a rebuild.
- en → uk
English → Ukrainian
Read any English page and get Ukrainian translations in the popover, each tied to the specific sense in front of you.
- uk → en
Ukrainian → English
Switch on Improved Quality and read Ukrainian with English glosses, IPA, and examples anchoring each word.
- shared core
Both directions, one core
Mastery states and the FSRS review queue behave identically whichever way you learn; Ukrainian needs Improved Quality switched on.
- roadmap
Built to extend
The architecture supports more language pairs. We're starting with the two we can do well, and being honest that that's where it stands today.
on your device
Your pages stay on your device.
The reading happens in your browser. To show a word's meaning, lemmaro looks up that word — not your page — from its dictionary.
The work that decides what to highlight happens right in your browser, so your page isn't uploaded to be understood. When you open a word, lemmaro fetches its meaning, pronunciation, and senses by that word; for genuinely ambiguous words, it sends just that one sentence so the right sense shows. It looks up words, not pages.
Read in your browserin your browser
The work that drives the highlighting happens in your browser, quietly in the background. Your page is read where it already lives and isn't uploaded or stored.
Words, not pagesby word
Lookups are keyed by word. lemmaro asks its dictionary for "render" — not for the article you found it in.
Works in your browserbrowser extension
It's a standard browser extension. It runs today on Chrome and Firefox — and on Brave, which installs the Chrome build — with more browsers on the way.
one engine · more browsers on the way
FAQ
Questions, answered plainly.
No asterisks, no roadmap hand-waving. Here's where lemmaro actually stands today.
Is it free? Is it really launched yet?
lemmaro is pre-launch, so there's no store listing yet and no fake "10,000 users" badge — what you see is the real product, honestly described, ahead of the public release. The core loop — reading, highlighting, the word card, your Library, and FSRS review — is free. An optional Pro tier adds deeper word-card detail; you never need it to learn a word.
What does the Pro upgrade add?
Everything that runs the daily loop is free. Pro deepens the word card — richer synonym guidance (which near-word fits the sentence, how formal it is, whether it's a safe swap), per-sense collocations, and a quick "which word fits?" check — for when you want to move past meaning into nuance.
Does it slow down the pages I read?
lemmaro reads the page quietly in the background, then lays its highlights over what you're already reading. The page loads as normal; the color-coding appears a moment later.
Is my reading actually private?
The reading that decides what to highlight happens in your browser — your page isn't uploaded or stored. To show a word, lemmaro fetches its meaning, pronunciation, and senses by that word; for ambiguous words it also sends that one sentence to pick the right sense. So lemmaro looks up words, not pages.
Which browsers does it support?
Today it runs on Chrome and Firefox — and on Brave, which installs the Chrome build. More browsers are on the roadmap, and "Add to Chrome" is just the first door in.
Which languages can I learn?
Today: English out of the box, plus Ukrainian when you enable Improved Quality — in both directions. The architecture is built to add more languages without re-engineering the core.
How does it decide what I already know?
Every word carries a personal mastery state — new, learning, familiar, or known — and that's what drives the highlight color. As you save and review words, FSRS spaced repetition updates each word's state over time, so the highlighting tracks what you actually know, not a generic frequency list.
Why was a particular word highlighted?
Open the popover and the "why was this highlighted?" explainer tells you — it shows the lemma it resolved to and its current mastery state, so the color is never a mystery.
add to chrome
Turn the web into your vocabulary.
Every page you already read, quietly working as your study deck.
Pre-launch — the store listing isn't live yet. The button lands the moment it ships.