Hi! I'm Lex 👋

Vocabulary that actually sticks

AI builds new exercises around the words your teacher uploaded. Your level adjusts after every answer — no two sessions look the same.

Your teacher already set everything up. Just sign in.

Choose the definition
Advanced
driven
Adjective /driv-en/
To accidentally cause problems for yourself.
Very determined to succeed, highly motivated.
The highest point of a mountain.
A raised, uneven part on a surface.

Three ways to make words stick

Six exercise modes grouped into the parts of learning that actually matter.

AI-powered

Practice you can't memorize

Every situation, cloze sentence and feedback line is generated by AI in real time. You can't game the system because the prompts are new every session.

  • AI Situations — real-world scenarios that hint at the word.
  • Cloze exercises — fill-in-the-blank sentences from a fresh pool.
  • Use in a sentence — write your own; AI grades meaning and grammar.
Classic + adaptive

The drills that work, smarter

Multiple-choice and flashcards are still the fastest way to lock in vocabulary. Stuvi just makes them adaptive: difficulty climbs with you, and a mastery score per word decides what you see next.

  • Word → definition — adaptive distractors that get harder.
  • Definition → word — reverse the direction to test recall.
  • Flashcards — self-assess and the score adjusts.
Personality

Meet Lex

Lex the chameleon reacts to every answer. He celebrates streaks, thinks alongside you, and shrugs off a miss with encouragement. It sounds small but it makes 10 minutes of vocab not feel like homework.

Three steps to better vocabulary

Teachers set up the words, students practice at their own pace, and everyone sees the progress.

1

Teacher uploads words

Paste vocabulary lists with definitions and examples. Create quizzes and assign them to student groups. Takes under 2 minutes.

2

Students practice

Each student works at their own level. The system adapts difficulty automatically: from Starter to Expert. Six different exercise types keep things fresh.

3

Track progress

Teachers see each student's mastery per word, weak spots, and session history. Students see their own progress bar, streaks, and level badges.

Lex adapts with you

Your study buddy changes expression based on how you're doing. He keeps you motivated and makes learning feel personal.

Ready
Correct!
On fire!
Thinking
Oops
TRY! Try again
Start practicing now

Spend class time on teaching, not chasing

Stuvi tells you who hasn't practiced, which word the class is choking on, and which quiz is about to land underprepared. No spreadsheets, no manual tracking.

  • Alerts you can act on — "5 inactive students", "Quiz X is at risk", "70% of the class fails this word."
  • Per-student detail — last activity, accuracy, traffic-light view of every word they've touched.
  • Mastery score per word — see if a student is locked in (≥80) or shaky, in one glance.
  • Email reminders — welcome, "new quiz assigned", 7/3/1 days before the exam.
Try the teacher demo
Alerts 4
3 inactive students
No sessions in 5+ days
5d ago
Quiz: Unit 3 at risk
Due in 3 days · 2/8 practicing
25%
Tough word: "summit"
75% of the class struggles
75%

Ready to level up your vocabulary?

Join your class, pick a quiz, and start practicing. Your teacher has already set everything up for you.

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