A mastery-based system modeled on Math Academy: adaptive diagnostic surfaces your knowledge frontier, a graph of ~130 HSK-4 topics structures what to learn next, nothing new unlocks until you can prove what you know, and spaced repetition keeps everything you've mastered from fading.
Try a real HSK 4 exercise
他把护照___在出租车上了。
The full HSK 1→6 knowledge graph — same idea as Math Academy's famous curriculum map, but for Mandarin. Hover any node to see the topic. Click to highlight its prerequisite chain. HSK 4 is where you start.
Preview dataset (~95 of 130 topics). Full graph builds from the HSK vocabulary + grammar corpus in Phase 2.
Not a course you push through regardless of what you've retained. A system that only moves you forward when you've actually learned what came before.
20–40 questions, binary-search style, maps your exact knowledge frontier across all ~130 HSK-4 topics. Free. No account needed at first.
The system finds topics where all your prerequisites are mastered and serves you those lessons first — grammar, vocab clusters, and conversation drills together.
Each topic requires a rep score ≥ 2.0 before its dependents open. Timed quizzes every 150 XP verify retention across everything you've learned.
FIRe-lite decay scheduling surfaces reviews exactly when memory is about to slip. Mastered topics propagate credit to related topics; failures propagate warnings back up the graph.
All 600 new HSK 4 words drilled in authentic sentences — MCQ, cloze, and sentence ordering. Every word appears in at least two exercises per topic.
~60 grammar points (把-construction, resultative complements, 越…越…, and more) taught with worked examples and tested with graded exercises at three difficulty levels.
2–3 spoken question patterns per topic — the memorize-questions→conversation method. Auto-graded best-response MCQ counts toward mastery; self-rated speak-aloud builds fluency.
~130 topics in a dependency DAG — vocab clusters, grammar points, and skill topics. Mastering a topic propagates partial credit to related ones; failing flags them for review.
10-question, 10-minute quizzes fire every 150 XP. Score ≥70% earns a rep bonus; below 70% triggers a targeted remediation task before any new topics unlock.
FIRe-lite: memory decays as a half-life function of your interval. Reviews surface when memory drops below 50%. Intervals stretch from 1 day to 120 days as you demonstrate retention.
Stripe integration ships in Phase 5 — get notified below and lock the founding price.
A single tutor session costs more, doesn't track what you actually retain, and ends when the hour does. HSK Mastery works every day at the exact edge of what you know.
The adaptive diagnostic is free and always will be. Enter your email and we'll send you access the moment it launches, plus a personalised report of your frontier and first lessons.
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The diagnostic is free. Take it, see your frontier, and start learning at exactly the right level.
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