You can recognise an idea in your notes and still be unable to produce it. That is the familiarity trap — it feels like knowledge because the page makes sense while you are looking at it. When the page disappears, the structure disappears too.
Paper Tiger is output-first. Instead of asking, “Have I read this?” it asks: Can I say this? You explain a topic from memory, Paper Tiger grades it against a fixed answer key, and then it tells you what to repair and when to return.
The research behind answer-first practice — retrieval, spacing and desirable difficulty — lives on the evidence page, with citations.