Both answer your questions and cite their sources — in fact, that's their most valuable shared trait. The difference lies in that "their": NotebookLM reads only the documents you give it; Perplexity searches the entire web. One works with a body of material you already own, the other explores what you don't know yet.
Good news: both have a permanent free plan and are rated "Easy" in our profiles. So the choice comes down entirely to how you'll use them, not to your budget.
Our verdict never depends on a commission: affiliate links are disclosed, and they change neither the order of this comparison nor its conclusion. (Our Method)
| Criterion | NotebookLM | Perplexity |
|---|---|---|
| The idea | Google's research assistant: you give it your documents, it reads them all and answers your questions, citing its sources. It can even generate a podcast-style audio summary. | An AI search engine that answers your questions directly, citing its sources: you get a summary with links to verify, without opening ten tabs. |
| The sources | Yours only: you import up to 50 sources (PDFs, documents or links) into a notebook, and it answers from them. | The web: it searches, summarizes and attaches its sources to every answer. |
| Price | €0/month with a free Google account (up to ~€22/month for the Pro version, with more capacity). | $0 to $20/month for search (Pro $20, $17/month billed annually); Max $200/month ($167 billed annually) for intensive agent use (Computer, Teammates). |
| Free plan | Yes: free with a Google account, with no time limit (paid Pro version optional). | Yes: permanent free plan, with no time limit. |
| Difficulty | Easy. | Easy. |
| Ideal for | Students, researchers and professionals who accumulate PDFs, articles and notes: studying, cross-checking and summarizing a closed set of documents. | Anyone who researches for work or out of curiosity and gets lost between ten tabs, contradictory articles and sponsored results. |
| Guardrails to know | Check the answers on the points that really matter by clicking through to the cited sources. Avoid putting highly confidential documents in it without reading the privacy settings first. | On sensitive topics (health, money, legal matters), always click through to the cited sources instead of taking the summary at face value: AI summarizes well, but it can be confidently wrong. |
See also: Perplexity or Deep Research? — for digging deep into a web topic, rather than questioning your documents.
It's not a web search engine: it answers from the sources you import into your notebook (up to 50). Freely exploring the web is Perplexity's job.
Yes, that's what they have in common: NotebookLM cites passages from your documents, Perplexity attaches the web pages it used. Either way, click through to the sources to check the important points.
Both: NotebookLM is free with a Google account (Pro optional, up to ~€22/month for more capacity) and Perplexity has a permanent free plan that is more than enough for everyday use (paid up to $20/month).
Comparison updated on October 31, 2026 — see what's new in the directory.