ResearchFreemium
NotebookLM
Best for: Studying or synthesising a closed set of documents.
Upload your documents and the model answers only from them, citing the source. Includes podcast-style audio summaries.
Who it's for
For students and researchers working with a closed corpus of PDFs or notes.
Pros / Cons
- Answers anchored to your sources, with citations
- The audio summary is surprisingly useful
- Simple interface for uploading many documents
- Does not search the internet: only your corpus
- Limits on sources and size per notebook
Alternatives
Perplexity · Elicit · ChatGPT
Independent editorial profile. Prices and features change; confirm on the official site before deciding.