NotebookLM, Google's research assistant, reasons exclusively over the documents you feed it: PDFs, websites, YouTube videos or personal notes. It turns them into reliable, cited summaries and can even transform your sources into an audio podcast where two voices discuss the content — a feature that has achieved cult status. Powered by Gemini 3, it also generates video overviews and Deep Research reports.
Sign in with a Google account at notebooklm.google.com and create a notebook. Import your sources: PDF documents, Google Docs, web links or YouTube videos. Then ask your questions in the chat: every answer cites the exact passages it draws on. The Audio Overview button generates a podcast-style discussion from your documents, and Video Overview turns them into a short explainer video.
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The risk is greatly reduced because the tool relies only on the sources you provide and cites its passages. If the information isn't in your documents, it says so rather than improvising.
The core service is free with a Google account. The Plus and Pro versions, included in the Google AI Plus and Google AI Pro subscriptions respectively, raise the limits on notebooks, sources and Audio Overviews.
Halfway between a search engine and a conversational assistant, Perplexity answers your questions while systematically citing its sources. Every claim is linked back to the web pages it consulted, making it a valuable tool for market monitoring, documentary research and fact-checking.
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