TongTong now has Stories — short, graded Mandarin texts pitched to your level, with synced audio, tap-to-look-up, and the words you don't know yet gently highlighted. Here's how to use them.
TongTong — a free, adaptive Chinese vocabulary trainer — is now in open beta. Here's what it is, how it places you at the right HSK level from your first session, and how to start.