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Glean vs Gemini Notebook
A plain-English comparison to help you choose between them.
Both refuse to answer from the open web, and they close the world in different places. Gemini Notebook is deliberately closed to the sources you upload, answering strictly from that material with passage-level citations you can click, and building study and briefing artefacts around it. Glean closes the world to your organisation instead, indexing every connected application and filtering results to what each person's permissions allow. Pick Gemini Notebook when the corpus is a project's documents and mastery of them is the job; pick Glean when the corpus is the company itself and nobody knows where anything lives.
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Side by side
- Summary
Glean is enterprise search that respects who you are: it indexes the organisation's applications and answers questions with citations, showing each person only what their permissions allow. The knowledge sprawl across drives, wikis, tickets and chats becomes one queryable surface.
Its Work AI direction builds on that foundation: assistants and agents grounded in company knowledge, with the permission-awareness that makes enterprise deployment survivable.
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It is bought at organisational scale: the indexing, connectors and governance assume hundreds of seats and a real IT function.
- Best for
- Search across the organisation's applications at once
- Permission-aware answers that respect access rights
- Cited answers grounded in company content
- Assistants and agents on the same governed foundation
- Organisations drowning in knowledge sprawl
- Cost
- Enterprise
- Ease
- Openness
- Hosted service
- Data
- Glean indexes your company systems with permissions preserved; its security model is the product, review it accordingly.
- Summary
Gemini Notebook (formerly NotebookLM) is Google's source-grounded research tool: upload documents, slides, links and data, and it answers strictly from that material, with citations that jump to the passage. It does not wander to the open web unless you ask it to find sources, which is exactly the point.
Around the grounded core sit generated study and briefing artefacts: podcast-style Audio Overviews, Video Overviews, mind maps, flashcards, quizzes and reports built from your corpus. Notebooks persist, so a project's material becomes a living, queryable body of knowledge.
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The free tier is generous enough for real work; paid Google AI plans raise source and usage limits. It complements a general assistant rather than replacing one: this is mastery of what you have, not discovery of what you lack.
- Best for
- Question-answering grounded strictly in your uploaded sources
- Passage-level citations you can click and check
- Audio and video overviews of dense material
- Study aids: mind maps, flashcards, quizzes and guides
- Living notebooks that grow with a project
- Cost
- Freemium (Free tier + paid plans)
- Ease
- Openness
- Hosted service
- Data
- Uploaded material sits on Google servers; avoid uploading confidential student records without checking institutional/Workspace terms. Grounded answers reduce but do not eliminate error: human-review generated quizzes/summaries for accuracy.
Pricing
- Glean
Custom·Custom
Prices as of August 2026.
- Glean Core Suite
- Price on applicationno list price published
- Glean Model Hub Usage
- Price on applicationusage billed at API rates
- Gemini Notebook
- Free tier; paid Google AI plans raise limits
By area
Where each one pulls ahead, area by area.
| Area | Glean | Gemini Notebook |
|---|---|---|
| By job | ||
| Legal & compliance | Glean treats the permission model as the product: connectors sync each source's access controls so the index never becomes a way around permissions nobody intended to grant, and fewer copies get made because material was hard to find | Gemini Notebook makes the closed world the safety feature: a data room loads and the answers come only from it, so orientation happens before the expensive hours without anything leaking in from outside |
| By task | ||
| Search & knowledge retrieval | Glean's permission-awareness is the feature that justifies the price, and it lets assistants and agents build on the same governed foundation rather than each getting its own access | Gemini Notebook works when the knowledge to search is a corpus you can assemble yourself and provenance is part of the requirement rather than a nicety |
Common questions
Which one does a single researcher actually want?
Gemini Notebook, without much hesitation. Its free tier is generous enough for real work, notebooks persist so a project's material becomes a living queryable body, and the audio and video overviews genuinely help with dense reading. Glean is an organisational purchase with connectors and governance behind it, which does nothing for one person's reading list.
Does the permission model matter if everything is already shared?
Less than you would think it does, and that is a real argument for the simpler tool. Glean's permission-awareness earns its cost where access genuinely differs across the company, which is most enterprises. A flat organisation where everyone sees everything is paying for governance it does not need, and a grounded notebook over the same documents answers the same questions.
How do the two fail?
Identically, which is worth knowing. Grounding inherits your sources' flaws: the wrong documents produce well-cited wrong answers in Gemini Notebook, and stale documents produce well-cited stale answers in Glean. Neither system can tell you that the corpus it was pointed at is out of date, so both make document hygiene a live operational duty rather than an afterthought.
Related comparisons
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Tool facts last checked August 2026