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NotebookLM

Google’s source-grounded notebook for multi-doc Q&A and study guides.

Best for: Multi-document research notebooks

Pricing: Free (product limits apply)

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Strengths

Research & sourcing · supporting — Grounded multi-doc notebooks.
Classroom / teaching · supporting — Grounded study guides from your handouts.
Personal knowledge & notes · alternative — When sources are a pile of PDFs and you want grounded Q&A fast.
Customer support knowledge base · supporting — Q&A over a small set of policy PDFs.
Legal-ish document triage (not advice) · alternative — Grounded notebook UX for multi-PDF sets.
Presentations & workshop slides · supporting — Ground the talk on handouts/PDFs.
Grant & STEM proposal drafts · supporting — Q&A over RFP PDFs.
RAG over internal docs · alternative — Fast grounded notebooks for smaller corpora.