Recognising a word isn’t knowing it.You know a word when you can produce it — from memory, the moment you need it.

The one belief the whole tool is built on

Why it exists

I built the tool I wished existed.

I built Lexi for myself first. I’d spent years reading English — I could recognise thousands of words on a page and nod along. But when I sat down to write, or had to say the thing out loud, most of them weren’t there. I knew them the way you know a face you can’t put a name to.

That gap bothered me. Every vocabulary app I tried measured the wrong thing: it showed me a word, I thought “yes, I know that,” and it took my word for it. Recognition felt like progress, but it wasn’t the skill I actually needed. I didn’t want to recognise words. I wanted to reach for them.

So I built something that refuses to call a word “known” until I can produce it from memory, cold. I use it every day. At some point keeping it to myself started to feel a little selfish, so I opened it up to anyone who wants it.

It’s still a solo, independent project — no team, no company behind it, no “we, a group of experts.” Just one learner’s honest answer to a problem I couldn’t shake, shared in case it helps you too.

— the maker of Lexi

The method

How that belief becomes a practice.

The idea only matters if the tool holds you to it. So every word climbs a five-stage ladder, and a word is never marked mastered on recognition alone — you have to produce it, and keep producing it, first.

NewJust met. You see it in context first, no pressure.
RecognitionYou can spot it in a sentence and fill the gap.
RecallYou can retrieve the word from its meaning alone.
ProductionYou can use it yourself — in a sentence, a translation, a real reply.
KnownMastered. It quietly steps out of rotation so you focus on the rest.

The exercises are mostly typed, not multiple-choice, and the kind you get is chosen by where the word sits on the ladder — a gentle flashcard low down, writing your own sentence near the top. So you can’t coast on one memorised answer. A word only reaches Known after four good answers in a row, and by then you’ve had to produce it yourself. Weak and stale words resurface on their own, right before you’d forget them, so nothing you’ve worked for quietly slips away. See the full method.

Your data

Plainly, what happens to your data.

It’s yours, and it’s isolated

Lexi is multi-tenant: your words, your progress and your writing live under your account and yours alone. Other people using Lexi can’t see any of it. The curated word packs are shared, but your practice history never is — with one exception you choose: if you join a class, that class’s teacher can see your full Lexi report for as long as you’re in the class. You agree to it when you join, and leaving the class removes their access immediately.

Google sign-in, no passwords

You sign in with Google, so there’s no password for Lexi to store or leak — it never sees one. It keeps your email, name and profile picture only to know which account is yours.

Self-hosted and independent

Lexi runs on its own server, not on a big platform. Your data sits in one database there. It isn’t sold and isn’t shared — with one honest exception: the text you submit for the two AI features, enriching a new word and scoring your writing, is sent to a few third-party AI providers only to produce that result, and only when you use those features.

You can read it all, or delete it

The full details — exactly what’s collected, which providers, and how to get your data out or have it deleted — are in the Privacy Policy and Terms of Service. Nothing on this page is hidden in the fine print.

Learn a word until it’s yours.

No pitch, no pressure. If the belief at the top of this page rings true, the rest is just practice. Sign in with Google and try it.

Start practicingFree to start · one tap with Google