Gemini Notebook (NotebookLM)

Gemini Notebook, the product Google launched as NotebookLM and still lists under that name in some app stores, is a research workspace that answers only from the files you put in it. We read four editorial write-ups dated 2 October 2025 to 12 June 2026, Google's release notes and help pages, the two app-store listings for its mobile app, and a developer thread, all read on 26 September 2026.

The version in question runs on Gemini 3.5 with a secure cloud computer in every notebook, both from the June 2026 upgrade, and was renamed Gemini Notebook on 16 July 2026. Google says more than 30 million people and over 600,000 organizations use it. The buyer tier is thin: two headline ratings from one page load each, and no owner review read one by one.

Consensus

Three of the four editorial write-ups we read describe the same core: it answers from the sources you upload. CNET calls your sources the only source of truth and says the tool will not scour the internet for an answer. XDA Developers, writing in June 2026, says everything it told the writer could be traced back to a source. Tom's Guide says it works from the documents you upload. Google's help pages say it from the other side: the tool is designed to answer from the information in your uploaded sources.

The second agreement is the format people arrive for. Audio Overviews, the two-host discussion made from your sources, are named first in three of the four editorial pieces: CNET opens its standout features with them, TechRadar lists them among three pros, and Tom's Guide used them to catch up on a week of notes.

What else the reviews agree on is a boundary, not a benefit. One project per notebook is the design, and Google's help page states it plainly: each notebook is independent, and the tool cannot reach across several at once.

This reads how the product is designed and what four write-ups make of it, not a measurement. Google's own release notes put the June upgrade at a 65% average win rate, in Google's side-by-side evaluation against its prior system.

Recurring strengths

Inline citations are the strength the sample treats as settled, named in three of the four editorial write-ups. CNET describes every answer pointing back into the source. XDA Developers says the citation and the passage it opens are what made it trustworthy. Tom's Guide describes asking questions of a document pile instead of rereading it.

Audio Overviews are named in three of the four and are the feature each spends longest on. CNET calls them the thing people mention first, and Tom's Guide used them to catch up on a week of notes.

Output breadth is a Studio-panel fact before it is an opinion. Google's help page lists notes, audio and video overviews, mind maps, reports, data tables that export to Sheets, flashcards, quizzes, slide decks and infographics. Two of the four editorial write-ups describe making several: CNET names audio, video, slide decks and study guides, and XDA Developers asked its notebook for a PDF report and a slide deck.

The free tier is the last thing the sample treats as a strength. Google's FAQ puts the limit at 500,000 words or 200MB per source on every plan, and the free arrangement at 100 notebooks of up to 50 sources each.

Recurring complaints

The mobile app trailing the web app is the complaint with the most visible documentation, in the buyer tier. On Google Play's listing the three most-helpful reviews visible in one page load agree that the Studio area offers little beyond audio: one from September 2025 says it offers nothing but AI voice overviews, one from June 2025 that flashcards and other outputs are missing, and one from October 2025 that the podcasts stop at twenty minutes with no playback memory. On the App Store listing a June 2025 review asks for parity with the web version. CNET describes the app arriving with almost no Studio features and gaining them slowly, and Google's help pages flag mobile limitations.

No query can cross notebooks. Google's help page states that as a design fact, and The Prompt Layer, a review site, calls it the single biggest daily friction point in three weeks of use.

Answers stop where the sources stop. CNET lists being limited to Google's models among its cons, and says the tool is only as good as what you feed it. TechRadar's verdict says it does not replace manual reading and fact-finding. A University of Michigan learning-technology office reports that generated multimedia filled gaps with plausible but incorrect material when the sources were web pages.

None of this is a count of complaints. The stores publish ratings, not complaint counts.

Where reviewers split

The June 2026 upgrade split the product's most sympathetic reviewer from its maker. XDA Developers, which had used it since its Google Labs days, says the update made the tool reach for the open web on its own, trading what made it special for something it does not need. Google's release notes present the same capability as source discovery that stays grounded and attributed.

The phone app divides one store page from another. The App Store shows 4.9 from 52,000 ratings and a prominent review praising the learning on the go; Google Play shows 4.7 from about 292,000 reviews with its most-helpful reviews describing the web app's Studio panel missing.

Audio Overviews divide orientation from authority. CNET and TechRadar treat them as the feature to try; The Prompt Layer reports that an overview smoothed a disagreement between two sources into a narrative neither supported, and the Michigan office reports errors in the multimedia it generated. The dissenting sources describe using them as an orientation pass.

Dating is the last split. Two of the four editorial write-ups are dated before June 2026, TechRadar's from October 2025 above all, and a third carries no date, while the maker's pages describe only what the upgrade added.

Who it suits

You already have the documents. Three of the four editorial write-ups count that grounding as the tool's core.

You want a pile of files turned into something you can listen to. Audio Overviews are named first in three of the four, and Google's help pages describe the four formats they come in.

You work one project at a time and want answers traced to the passage. Notebooks are independent by Google's own description, and inline citations are the strength named in three of the four.

Who should pass

You need answers about anything that is not in your files. CNET and TechRadar both describe that boundary, one as a listed con.

You want to ask across several notebooks at once. Google's help page says the tool cannot, and The Prompt Layer calls it the biggest daily friction point in its own weeks of use.

You need the phone app to do everything the web app does. The most-helpful reviews on the app's own store listing describe the Studio panel missing from it.

You would use it instead of careful reading where a wrong sentence costs you. TechRadar's verdict says it does not replace manual reading and fact-finding.

This is a reading of published reviews, not medical, financial or legal advice. For a decision about your health, your money or your rights, a qualified professional is the right next step, and not a review.

One verdict a week: the most useful Master Review we finished, the complaint that kept appearing, and who should skip it. Get the weekly verdict.

Sources

• Google's release notes: official, 8 June 2026.
• Google's rename announcement: official, 16 July 2026.
• Google's help page, the product: official, read 26 Sep.
• Google's help page, making a notebook: official, read 26 Sep.
• Google's help page, Audio Overviews: official, read 26 Sep.
• Google's help FAQ: official, read 26 Sep.
• CNET's review: editorial, read 26 Sep.
• TechRadar's review: editorial, 2 October 2025, before the June 2026 upgrade.
• Tom's Guide's hands-on: editorial, 9 May 2026.
• XDA Developers' hands-on: editorial, 12 June 2026.
• Google Play's listing: buyers, read 26 Sep, headline figures only.
• The App Store listing: buyers, read 26 Sep, headline figures only.
• Hacker News API search: forum, run 26 Sep.
• Hacker News, the thread on the rename: forum, 16 July 2026.
• The Prompt Layer's review: other, read 26 Sep.
• University of Michigan LSA office, a critical look: other, 12 March 2026.

On 26 September 2026 we read four editorial write-ups published from 2 October 2025 to 12 June 2026, Google's release notes and help pages, two app-store listings loaded once each and two developer threads, by web search and plain page fetch, and synthesised them with AI; nothing was tested.