AccelaStudy AI measures communicative competence — not lesson completion — across all four language skills, with L1-aware sequencing that knows which errors your native language will cause.
Duolingo has 100M+ monthly users. Independent research confirms it does not produce fluency. Current apps test recognition (pick the right answer) but not production (generate the right answer). Learners plateau at B1 with no diagnosis of why or how to break through. L1 interference is the #1 predictor of L2 difficulty, and every major app ignores it.
60–70% of learners plateau at B1 (intermediate) with no diagnosis
Current apps test recognition only, not production or fluency
L1 interference is #1 predictor of L2 difficulty — ignored by every major app
$60B+ market with no product delivering measurable fluency outcomes
A Spanish speaker learning Portuguese receives a fundamentally different path than a Japanese speaker learning Portuguese. The system predicts L1 interference patterns and preempts the errors before they fossilize into habits.
Listening, speaking, reading, and writing are tracked independently. The system detects receptive-productive gaps (understanding more than you can say) and closes them with production-focused activities.
When you stall at B1, the system diagnoses the specific cause: syntactic complexity ceiling, pragmatic register gaps, phonological accuracy, or discourse coherence — and prescribes targeted intervention for the actual blockage.
"Your current trajectory predicts B2 in reading and B1 in speaking. Targeted speaking practice for 6 weeks closes the gap." Plus test readiness predictions for DELE, DELF, JLPT, TOEFL, IELTS, HSK, TestDaF, and more.
| Metric | Traditional Apps | AccelaStudy AI |
|---|---|---|
| Time to B1 | 200–300 hours | 120–180 hours (40% faster) |
| Time to B2 | 400–600 hours | 250–350 hours (40% faster) |
| Productive fluency at B1 | Weak (recognition-dominant) | Balanced across all 4 skills |
| Plateau rate at B1 | 60–70% of learners | Diagnosed and resolved |
| Test readiness prediction | None | Continuous, accurate |
Build genuine fluency with adaptive intelligence that works from your first lesson through advanced proficiency.