Hello-Hello tracks the words you know against the top 10,000 most common in your target language. Each AI-generated dialog uses mostly the words you already know, with a few new ones woven into natural conversation.

New words land inside conversations you can already mostly understand. They reappear in different dialogs — same word, different scenes, different speakers — until they settle into the "known" column. Repetition that feels like reading.

You set the pace. Dialogs grow with your vocabulary — the further you go, the more complex the conversations get. This is how kids learn languages — by exposure and repetition, wiring the brain naturally. Hello-Hello brings the same approach to adults.