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AI-powered ESL training built for Brazilian professionals. CEFR-aligned exercises, adaptive placement, and a tutor that actually knows your level.
No credit card required. Find your CEFR level in 5 minutes.
From the makers of Liceu Underground
100%
AI-Generated Content
CEFR
Aligned A1–C2
24/7
AI Tutor Available
R$49
/month Pro Plan
Four steps from zero to fluent. No paperwork, no scheduling, no waiting.
15 adaptive questions powered by Claude. We find your exact CEFR level — A1 through C2. Takes 5 minutes. Free.
See your CEFR level instantly. Your personalized exercise queue is generated and ready to go.
MCQ, fill-in-the-blank, vocabulary, and listening exercises. Earn XP, build streaks, climb the leaderboard.
Our AI tutor adapts to your level. Practice conversation, ask grammar questions, get real-time feedback.
Not another gamified kindergarten. This is serious English training for adults who need results.
Claude generates exercises tailored to your level and topic. Always fresh, always relevant.
15 questions that find your exact CEFR level. No guessing, no wasting time on content that's too easy or too hard.
Daily streaks, XP system, weekly leaderboards. The kind of motivation that actually sticks.
Native-quality audio generated by OpenAI TTS. Train your ear with real-world English at your level.
A conversational tutor that knows your CEFR level. Practice anytime, get corrections that actually help.
Teachers can assign exercises, track progress, and reset levels. AI generates, humans verify.
We're not Duolingo for adults. We're not a boring textbook. We're something in between.
| Feature | Lexio | Duolingo | Traditional ESL |
|---|---|---|---|
| CEFR-aligned content | ✓ | ✗ | ✓ |
| AI-generated exercises | ✓ | ✗ | ✗ |
| AI conversational tutor | ✓ | ✗ | ✗ |
| Teacher oversight | ✓ | ✗ | ✓ |
| Professional/Business English | ✓ | ✗ | △ |
| Adult-focused UX | ✓ | ✗ | △ |
| Adaptive placement test | ✓ | ✓ | △ |
| Streaks & gamification | ✓ | ✓ | ✗ |
Finally, something that doesn't feel like a children's game. The exercises are actually relevant to my job.
Beta Tester
IT Professional
The AI tutor is genuinely good. It adjusts to my level and doesn't waste my time with stuff I already know.
Beta Tester
Finance Analyst
I've tried every app out there. Lexio is the first one where I feel like I'm actually making progress.
Beta Tester
Healthcare Worker
Start free. Upgrade when you're ready.
R$0/forever
R$49/month
Cancel anytime via Stripe customer portal. No questions asked.
Take the free placement test. Find your level. Start practicing in under 5 minutes.
Start for Free