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Sources, not vibes

NotebookLM

ResearchFreeNonfiction

You upload sources — PDFs, notes, docs — and ask questions grounded in that pile. It will also brief you in audio, which is a strange and sometimes useful way to hear your research. It is not a writing app. If a claim is not in the sources, it should say so, and you should still check.

Best for

Nonfiction writers sitting on a stack of sources they do not want a model to wander away from.

Pricing

Free. Free with a Google account. Features and limits change; there is no manuscript editor here.

Listing checked 14 October 2026. Plans move. The vendor's page wins an argument with this one.

Visit NotebookLMMore research tools

In-depth review

NotebookLM review

Last checked 14 October 2026 against the vendor's public pages. Prices and features change; check the vendor before you buy.

Writer's Toolbelt review

NotebookLM

Google's source-grounded research notebook, renamed Gemini Notebook in July 2026. It answers from your documents, not the open web.

sources per notebook, free
sources per notebook on Google AI Pro
sources per notebook on Google AI Ultra

What it is

NotebookLM is Google's source-grounded research assistant. As of July 2026 it's called Gemini Notebook. Google's FAQ says "it is the same product you know and love, and all of your existing notebooks remain fully accessible." You add your own sources, and it answers questions "grounded in the information you trust", "reducing the likelihood of AI errors and hallucinations". It can also turn your sources into Audio Overviews, Video Overviews, Slides, Mind Maps, Flashcards, Reports and Infographics.

Screenshot of NotebookLM's public home page
NotebookLM's public home page, captured 14 October 2026.

Who it's for

  • Nonfiction authors working from a pile of sources: interviews, papers, archives.
  • Novelists with research-heavy settings, such as historical, legal or medical fiction.
  • Series writers who want to query their own notes and published books for continuity.

Key features in practice

  • Source-grounded chat. Answers come from your uploaded material, with references back to it.
  • Source Discovery and Deep Research to find new material from inside the notebook.
  • Audio Overviews. Podcast-style discussions of your sources, good for reviewing notes on a walk.
  • Reports, Slides, Mind Maps and Video Overviews for synthesising material.
  • Source limits per notebook: 50 on the standard plan, 100 with Google AI Plus, 300 with Pro and 600 with Ultra.
  • Privacy. Google says individual users' data "is not used for training unless you share feedback". Organisation and school data is never used to train it.
Screenshot of NotebookLM's public home page, scrolled further down
NotebookLM's public home page, scrolled further down, captured 14 October 2026.

Pricing (checked 14 October 2026)

Plan Price Limits
Gemini Notebook Free Standard limits, up to 50 sources per notebook
In Google AI Plus $4.99/month (US) Double limits, early access, 100 sources
In Google AI Pro $19.99/month (US) 4x limits, priority access, 300 sources
In Google AI Ultra Check vendor site 5–20x Pro limits, 600 sources

Paid plans are available only in some regions. Business, Education and Enterprise versions come through Google Workspace or Google Cloud.

Pricing at a glance

  • Gemini Notebook (free)Up to 50 sources per notebook
    Free
  • With Google AI Plus2x limits, 100 sources
    $4.99/mo
  • With Google AI Pro4x limits, 300 sources
    $19.99/mo
  • With Google AI Ultra

    5–20x Pro limits, 600 sources; check vendor site

Gemini Notebook is free; higher limits come with Google AI subscriptions (US prices from gemini.google/subscriptions on 14 October 2026). Ultra-tier pricing: see the Gemini review or vendor site.
Screenshot of NotebookLM's public pricing page
NotebookLM's public pricing page, captured 14 October 2026.

Using it as a writer

  1. Create one notebook per project and add your research PDFs, interview transcripts and notes.
  2. Ask questions that need citations, such as "Where did I note the date of the flood?", and click through to the source.
  3. Use Audio Overviews to absorb research when you're away from the desk.
  4. Make a continuity notebook from your published books and series bible for consistency checks.
  5. Remember it only knows what you give it. That is the point, and also the limit.

Strengths

  • Grounded in your sources, which means fewer hallucinations.
  • Free and generous.
  • Audio and Video Overviews are unique and genuinely useful.
  • Clear privacy statement for individuals.

Writer's Toolbelt editorial scores

NotebookLM scorecard

9.4/10

  • Grounding in your sources10/10
  • Research synthesis9/10
  • Audio and video overviews9/10
  • Ease of use9/10
  • Value for money10/10
Editorial judgment by Writer's Toolbelt, not vendor data or user ratings. Scores are relative to other tools in this directory.

Weaknesses

  • Only as good as your sources.
  • Source caps on the free plan.
  • The rename may confuse people looking for "NotebookLM".

How it compares

  • NotebookLM vs Perplexity. Perplexity searches the web. NotebookLM works on your files.
  • NotebookLM vs Elicit or Consensus. Those find academic papers, which you can then load into NotebookLM.
  • NotebookLM vs Notion AI. Notion AI works across your Notion workspace.

Feature comparison

AI research tools compared

FeatureConsensusElicitScitePerplexityNotebookLM
Free planYesYesNoYesYes
Lowest listed paid priceYes$12Yes$49Yes$12Yes$17Yes$4.99
All paid tiers have published pricesYesYesPartlySome tiers: contact sales or check vendor sitePartlySome tiers: contact sales or check vendor sitePartlySome tiers: contact sales or check vendor site
Competes with ProseEngine (we disclose)NoNoNoNoNo
Derived from each review's pricing table (vendor pricing pages, checked 14 October 2026). Lowest price is per month (or per unit where stated) on the cheapest listed billing option. "Not listed" means the vendor page does not publish it; check the vendor site.

Verdict

For research you already have, NotebookLM (now Gemini Notebook) is the best free tool in this directory. Every nonfiction writer should try it.

FAQ

Is NotebookLM still available? Yes, as Gemini Notebook since July 2026. Existing notebooks remain accessible.

Is it free? Yes. Google AI subscriptions raise the limits.

Does Google train on my sources? For individuals, Google says no, unless you share feedback.

Sources

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