NotebookLM helps you read it. Synapsi makes you remember it.
NotebookLM is a free, trusted way to summarize and chat with your sources. But it has no spaced repetition, no mastery tracking, and no teach-back. Synapsi is the study loop that happens after you understand.
NotebookLM is excellent at understanding sources. It is not built to make you retain them. Synapsi picks up where it stops: real SM-2 review, an AI-judged Feynman teach-back, and a concept-mastery journey that runs until exam day.
Use NotebookLM to understand a pile of sources. Use Synapsi to make sure that understanding lasts past this week.
Prove you actually learned it.
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