Search & Research
Glean vs NotebookLM.
Both sit in Search & Research, scored on the same six pillars from the same published methodology. Here is where they actually differ.
The short answer
Glean scores higher — 86.3 against 83.2, a margin of 3.1 points. That is the overall answer, not the whole one: the pillar breakdown below is where the decision usually actually gets made.
Glean leads on integrations & ecosystem, maturity & reliability and security & compliance; NotebookLM leads on value for money.
Glean
86.3
Excellent
Enterprise AI search and assistant across all your company's apps.
- From
- Custom enterprise pricing
- Pricing
- Enterprise
- Maturity
- Mature
- Founded
- 2019
83.2
Excellent
Source-grounded research assistant with Audio Overviews.
- From
- Free / Plus $7.99 / Pro $19.99 (via Google AI plans)
- Pricing
- Freemium
- Maturity
- Established
- Founded
- 2023
Pillar by pillar
The same six pillars and fixed weights used for every tool on the site. A lead of fewer than 5 points is not called for either side — these are evidence-backed judgements, not measurements. Read the methodology.
Capability
Level
Value for Money
NotebookLM by 16
Security & Compliance
Glean by 9
Integrations & Ecosystem
Glean by 18
Maturity & Reliability
Glean by 12
Momentum
Level
Which one, and when
Pick Glean if
- →it has to fit the stack you already run — it leads Integrations & Ecosystem by 18 points.
- →it has to hold up in production from day one — it leads Maturity & Reliability by 12 points.
- →compliance and data control decide it — it leads Security & Compliance by 9 points.
- →Enterprise knowledge discovery
- →Grounded internal AI assistants
- →Large orgs with scattered tools
The catch
- Enterprise-only pricing and rollout
- Value depends on connector coverage
Pick NotebookLM if
- →cost per unit of output is the binding constraint — it leads Value for Money by 16 points.
- →Studying document sets
- →Onboarding onto a knowledge base
- →Turning reports into audio or video
The catch
- Per-notebook source limits constrain very large corpora
- No public API yet for workflow integration
What each is good at
Glean
- ✓Permissions-aware search across 100+ apps
- ✓Enterprise-grade security and governance
- ✓Agents grounded in company knowledge
NotebookLM
- ✓Answers grounded strictly in your uploaded sources with citations
- ✓Audio and Video Overviews turn any corpus into a podcast or narrated summary
- ✓Interactive Mode lets you interrupt an Audio Overview to ask questions mid-listen
Other comparisons in Search & Research
Comparing something else? Build your own side-by-side across any tools in the catalog.