NotebookLM vs Perplexity: your files or the web
Use NotebookLM when the material already exists: contracts, reports, course notes, a stack of PDFs or a YouTube talk. You add them as sources and every answer cites the passage it came from, so it stays inside what you gave it. Use Perplexity when you do not have the material yet and need the web to find it, such as a competitor's latest launch or this year's figures. Both are free to start. Many people use Perplexity to find sources and NotebookLM to work through them.
Which one to pick
You have the documents and want to question, summarise or study them, turn them into an Audio Overview or flashcards, and keep answers limited to those sources.
You start from a question, need current information from the open web, and want a short answer with links you can open and check.
Side by side
Questions
Can NotebookLM search the web?
NotebookLM can add web pages as sources, so you paste a link and it reads that page. Its answers then come from the sources in your notebook, not from a live search across the internet. Perplexity runs a fresh web search for each question. For news or prices that change, Perplexity is the right tool.
Which one makes fewer things up?
NotebookLM answers only from your sources and cites the passage, which keeps it close to the material. Perplexity also cites, but its sources are whatever the search finds, and quality varies by page. With either tool, click the citation before you rely on a figure. A wrong source gives a wrong answer in both.
Are they free?
NotebookLM is free with a Google account, and higher limits come with Google's paid plans. Perplexity has a free plan and a paid Pro plan for heavier use. For a few research sessions a week, the free tiers of both are usually enough. Upgrade the one you open every day.
Is my uploaded data safe in NotebookLM?
NotebookLM runs on your Google account, and Google's terms for that account apply to what you upload. With a Workspace work or school account, your organisation's admin settings and data terms cover it. Check those terms before you add client contracts or personal data. Keep confidential files out of any AI tool your company has not approved.
Can I listen to my research?
NotebookLM can turn your sources into an Audio Overview, a podcast-style conversation about the material, and it can also make video overviews, reports and flashcards. That suits learning on the go or briefing a colleague. Perplexity focuses on written answers and longer research reports. If audio matters to you, NotebookLM is the pick.