Chinese,
fine tuned
to your brain.
TongTong assesses your Mandarin from your very first session, then builds a personalised path that pushes the edge of what your memory can actually hold. No vocabulary import. No grinding from zero. Start exactly where you left off.
The whole language,
arranged around you.
TongTong sees the entire Chinese vocabulary at once. The line shows where you stand. Everything beneath it is in reach, everything above is ranked by what your mind is ready for next.
- 01No vocabulary to import.Place yourself in just a few cards. TongTong locates your position in the language in real time.
- 02The line moves with you.After every session your position shifts. The queue re-ranks; the next edge appears.
- 03Personal blind spots stay red.Words below your line you keep missing cycle back the moment your memory can hold them.
Comprehensible input.
Slightly beyond your edge.
Stephen Krashen's “i+1” hypothesis: learners acquire language best when they understand conversations slightly beyond their current proficiency. TongTong picks stories that match your level today, close enough to follow, just hard enough to grow.
Synced transcripts, level-tagged episodes, native-speaker narration. New episodes added every week.
All relevant vocabulary.
Ranked by what matters.
Most apps stop at HSK 6. TongTong studies the full 40,000+ word corpus. Every word a fluent speaker meets in real life. Continuously refined with modern conversational analysis so you learn the most useful, most frequent words first, and never waste a session on archaic vocabulary.
Your ability,
refined with every answer.
Most apps reduce you to a streak. TongTong models your ability as one continuous estimate, fusing three established sciences into a single picture of how you learn, and where you'll grow next.
Spaced Repetition
Each word lives on its own forgetting curve. TongTong returns it the moment your memory is about to slip, not a day too early, not a day too late.
Psychometrics
The science behind standardized tests, adapted for Chinese. Every answer estimates your ability against the entire vocabulary, not just the words you have seen.
Probabilities
A probabilistic model continuously infers what you know. Confidence rises, uncertainty narrows, the next card is always the one that teaches us most about you.
Your next review
is due.
Free. No subscription, no ads, no notifications hunting your dopamine. The same algorithm that ranks 40,000+ words is yours from the first card.