The complete guide
How Lexi works.
From first word to fluent.
Lexi turns words you half-know into words you can actually use — and grades your IELTS writing like an examiner. This guide walks through every part of the app in plain English. New here? Start with the five-minute Quickstart, then dig into whatever you need.
Get going · about 5 minutes
Quickstart: your first five minutes.
You don’t need to read this whole guide to begin. Follow these five steps and you’ll be practising real words in a few minutes. Everything else below just goes deeper.
Sign in with Google
One tap, no password. Signing in is how your progress follows you — practise on your laptop, carry on from your phone. It’s free to start.
Pick a pack (or paste your own)
Choose a ready-made pack — IELTS Task 1, IELTS Task 2, Casual English 100 or Academic Writing 100 — or paste your own list of words and let Lexi fill in the details. Browse packs →
Start practising
Hit Study and Lexi serves one word at a time, choosing the right kind of exercise for each. Answer, see the meaning and an example, move on.
Let the words climb
Get a word right and it moves up the mastery ladder; miss it and it slips back and returns sooner. You don’t manage any of this — Lexi does it for you.
Check your progress
Open the Report to see what’s mastered, what’s still weak, and your daily streak. Come back tomorrow — the weak words will be waiting.
Try IELTS writing
When you’re ready, write a Task 1 or Task 2 answer and get a band estimate with real corrections. Open Writing →
Step one
Building your vocabulary.
Everything starts with words in your list. You can grab a curated pack, paste your own, or add them one at a time — and Lexi does the boring part (meanings, examples, pronunciation) for you.
Collections keep your words organised
A collection is a named group of words — like a folder. Manage them on the Home page: create one, rename it (name, emoji and description), or delete it. Deleting a collection only removes the grouping — your words stay safe. A word can live in several collections at once, and hitting Study on a collection practises just that set. It’s a lens on your words, not a separate copy — your progress on a word is the same everywhere it appears.
Paste a list — the fast way to bulk-add
The quickest way to build a big list: open Add → Paste a list, paste your words (one per line, or separated by commas), and Lexi does the rest. For each word the AI fills in the Vietnamese meaning, an English definition, part of speech, IPA pronunciation, synonyms, common collocations, two example sentences and a false-friend note where it helps — so you never type IPA by hand.
- No duplicates. Lexi shows a preview of how many words are new versus already in your list, and skips repeats automatically.
- Spelling caught for you. If a word looks misspelled, Lexi corrects it and enriches the clean version.
- Up to 200 words per paste, to keep things fast and fair for everyone.
Prefer one at a time? Add → Single word lets you type a word, tap Enrich, review the draft, edit anything, and save. Nothing is saved until you say so.
Curated packs — start with expert lists
Don’t know where to begin? Adopt a ready-made public pack: IELTS Task 1 and IELTS Task 2 for exam vocabulary, Casual English 100 for everyday talk, and Academic Writing 100 for essays. You can even practise a pack before adding it — the words simply enter your rotation as new. When you like it, tap Add all and every word joins your list, keeping any progress you already made.
Private or public
Your own collections are private by default — only you see them. The curated packs are public, so they show up for everyone. Either way, your practice history is always your own.
The heart of it
How practice actually works.
Most apps stop at “I’ve seen this word.” Lexi keeps going until you can produce it. Two things make that happen: a mastery ladder every word climbs, and a smart picker that decides what you see next.
The mastery ladder — five rungs
Every word sits on one of five rungs. Answer correctly and it climbs one rung; miss it and it drops one. A word only reaches Known after a run of four good answers in a row — which means you’ll always have to use a word, not just recognise it, before Lexi calls it mastered.
The smart picker keeps about 35 words active at a time and quietly chooses what’s next. Words you just got wrong come back first, words your accuracy is slipping on get pushed forward, and anything you haven’t seen in a few days resurfaces on its own. Mastered words fade out. You never build a schedule — Lexi handles the timing.
Six ways to drill a word
Here’s the key idea: the exercise is chosen by the word’s rung, not by you. A brand-new word gets a gentle flashcard; a word near the top asks you to write your own sentence. That’s why you can’t just memorise one answer — as a word climbs, Lexi keeps asking more of you.
Meet the word in context and type it back — two directions, no self-grading.
Fill the gap in a natural sentence — spot the word in the wild.
Given only the meaning, type the English word from memory.
Translate between English and Vietnamese, graded for meaning — not exact spelling.
Use the word yourself, unaided — the AI tutor scores it and shows a better model.
Say the right thing in a real situation — the word used with the right tone.
A small typo counts as “Almost”, not wrong, and still moves you forward. Vietnamese answers ignore accents and accept any part of the meaning, so con cho matches con chó. Lexi is checking whether you know the word — not whether you typed it perfectly.
Beyond words
IELTS writing, scored like an examiner.
Practising vocabulary is half the battle. The Writing module lets you prove it in full essays and get honest, detailed feedback in seconds.
Two tasks
Task 1 asks you to describe a chart or graph in at least 150 words. Task 2 asks for an essay of at least 250 words responding to an argument or opinion — the two tasks in the real IELTS exam.
Add your own prompts on the Writing page: for Task 2, paste the question; for Task 1, paste the question plus the chart image and Lexi reads the numbers for you to confirm. Then write your answer and submit — one clean attempt, scored as it stands.
What the feedback gives you
- A band estimate overall and on each of the four official criteria: Task Achievement, Coherence & Cohesion, Lexical Resource and Grammar.
- Inline corrections on your actual sentences — each shows what to change, why, and a better word to use.
- “How to raise your band” — a few higher-level priorities, each with a model sentence to copy the shape of.
- Your strengths, so you keep what’s working, and an Export PDF button to save the report.
Don’t agree with a score or a correction? Every criterion, every coaching point and every inline fix has a 💬 Discuss with the AI thread. Ask it to justify a band, rewrite a sentence, or explain a grammar point — it answers grounded in your essay, quotes your words, and can add a Vietnamese explanation. Your conversations are saved with the feedback, so you can reopen them any time.
Staying on track
See your progress, everywhere.
Open the Report for one dashboard across both vocabulary and writing — no numbers to log yourself, it all comes from your real practice.
What the numbers mean
- Headline tiles — total words, how many you’ve practised, how many are mastered, how many are still weak, and your current daily streak.
- Mastery by stage — how your words spread across the five rungs, from New to Known.
- Activity & accuracy — your last two weeks of practice and how well you do on each exercise type.
- Writing — your band trend, your average per criterion, and your most common mistakes.
A word counts as weak when you’ve recently got it wrong or your accuracy on it has dropped below 60% — exactly the words the picker brings back to you.
It follows your sign-in
Because you sign in with Google, your progress lives with your account, not your device. Practise on your phone on the bus, open your laptop at home, and everything is exactly where you left it — same words, same rungs, same streak. Nothing to sync by hand.
Good to know
Quick answers.
Is it really free to start?
Yes. Sign in and practise for free. Only two things use AI — enriching a new word and scoring your writing — and everything else (flashcards, cloze, recall, all local grading) works with no setup at all.
Does it work on my phone?
Yes — the whole app is built for phones. Practise a few words whenever you have a spare minute; it syncs to every device you sign in on.
Do I get mastery just by clicking through?
No. Mastery is earned, not marked. A word only reaches Known after four good answers in a row, and near the top you have to produce the word yourself — so you can’t fake it.
What if I make a typo?
A small typo counts as “Almost,” not wrong, and still moves you forward. Meaning matters more than perfect spelling, and Vietnamese answers ignore accents.
Do I have to organise my own review schedule?
Never. Lexi’s picker decides what you see next — weak and stale words resurface on their own, and mastered ones step aside. You just keep answering.
Your climb to fluency
starts today.
Free to start · sign in with Google · works on your phone