Glean vs NotebookLM: Which AI agent is better?
Compare pricing, AI models, integrations, security posture, pros, cons, and buyer fit before choosing the right AI productivity agent for your workflow.
Verdict: Glean vs NotebookLM
Pick Glean if you need ai-powered enterprise workplace search across slack, gdrive, jira, and 100+ apps. Pick NotebookLM if you need ai-powered research and note-taking.
Glean supports 3 models.
Glean integrates with 13 platforms.
Glean
Glean is the leading enterprise AI work assistant — a search-and-answer engine that indexes your company's entire content footprint (Slack, Google Drive, Confluence, Notion, Jira, GitHub, Salesforce, ...
- Indexes 100+ enterprise apps with permission-aware retrieval
- Glean Assistant: chat with your company's entire knowledge
- Glean Protect: real-time DLP + sensitive-data classification
- Glean Agents: build custom AI workflows on company data
- Cross-app search results sorted by personal relevance
- Permission-aware retrieval — no data-leakage risk across employees
- 100+ integrations cover most enterprise stacks out of the box
- Cited answers ground AI in your actual company knowledge (not hallucinated)
- Premium pricing — typical mid-market commitments start ~$30-50/employee/year
- Sales-led with no transparent pricing or self-serve trial
NotebookLM
NotebookLM is Google's AI research and note-taking tool ranked #13 on the a16z Top 100 Gen AI Apps list, offering a unique approach to knowledge synthesis. Users upload source documents—PDFs, Google D...
- Source-grounded AI that only references uploaded materials
- Audio Overview generates podcast-style discussions from sources
- Inline citations for every AI-generated claim
- Support for PDFs, Docs, websites, YouTube, and audio uploads
- Up to 50 sources per notebook with 500K words each
- Source-grounded approach eliminates AI hallucination concerns
- Audio Overview podcast generation is genuinely innovative and useful
- Free tier provides substantial functionality for research
- Limited to uploaded sources—cannot access broader web knowledge
- Audio Overview generation can take several minutes for large sources
Who should buy this
Glean
- Mid-market or enterprise CIO / CTO consolidating internal AI search
- Knowledge worker drowning in Slack threads + scattered docs across 20+ apps
- IT / security org wanting AI search WITH permission enforcement (not retroactive cleanup)
- SMBs and startups (cost prohibitive — ChatGPT Team or Notion AI fit better)
- Teams not on a sprawling app stack (Glean shines with 10+ data sources)
Enterprise per-employee licensing — typically $30-50/employee/year (mid-market) to $100+/employee/year (large enterprise). Glean Protect + Agents are additional.
Verified 2026-05-03
NotebookLM
- Researcher or analyst synthesizing 5-50 source documents into briefs
- Student or grad researcher who needs citation-grounded answers from their own sources
- Podcast/content producer using Audio Overview as a brainstorming partner
- Buyers wanting general-web AI search (NotebookLM is source-grounded only by design)
- Enterprise security buyers needing third-party SOC 2 attestation specific to NotebookLM
Free for most uses. Plus: $19.99/mo (or bundled with Google AI Pro $20/mo). Workspace customers: included with Google AI add-on.
Verified 2026-05-02
Capabilities at a glance
| Capability | Glean | NotebookLM |
|---|---|---|
| 100+ enterprise app integrations | — | |
| Permission-aware retrieval | Inherits source ACLs | — |
| Cited / sourced AI answers | — | |
| Glean Protect (DLP + sensitive-data) | Add-on | — |
| Glean Agents (custom workflows) | Add-on | — |
| Slack / Teams native apps | — | |
| Public API | — | |
| On-prem / self-hosted | VPC deployment for select customers | |
| Source-grounded answers with citations | — | No hallucination from outside corpus |
| Audio Overview (podcast-style) | — | |
| PDF / Doc / web / YouTube / audio source ingestion | — | |
| Up to 50 sources / 500K words per notebook | — | |
| Team / shared notebooks | — | Plus+ |
Security & compliance
| Standard / control | Glean | NotebookLM |
|---|---|---|
| SOC 2 | Type II | — |
| ISO 27001 | — | |
| HIPAA | — | |
| GDPR | ||
| SSO / SAML | ||
| RBAC | — | |
| Audit logs | — | |
| Trains on customer data | No | No |
What users say
Glean
Plaid, Pinterest, Redis, Zapier, Databricks, Webflow, Grammarly, Duolingo, WealthSimple, Citi, Intuit, Samsung, Booking.com, Instacart, Zillow, Rivian, Samsara
Frequently asked questions
What AI models do Glean and NotebookLM use?+
Glean runs on GPT-4 family, Claude family, Glean proprietary retrieval models. NotebookLM runs on Gemini 2.5 Pro, Custom audio generation models.
What is the main difference between Glean and NotebookLM?+
Glean is positioned as best ai-powered enterprise workplace search across slack, gdrive, jira, and 100+ apps, while NotebookLM is positioned as best for ai-powered research and note-taking. Pick the one whose strength aligns with your primary use case.
Which has better integrations, Glean or NotebookLM?+
Glean integrates with Slack, Microsoft Teams, Google Drive, Notion and 9 more. NotebookLM integrates with Google Docs, Google Drive, YouTube, Web URLs and 1 more.
What are the main weaknesses of Glean and NotebookLM?+
Glean's main drawback: premium pricing — typical mid-market commitments start ~$30-50/employee/year. NotebookLM's main drawback: limited to uploaded sources—cannot access broader web knowledge.
Are Glean and NotebookLM worth it in 2026?+
Both remain competitive productivity options in 2026. Glean stands out for permission-aware retrieval — no data-leakage risk across employees. NotebookLM stands out for source-grounded approach eliminates ai hallucination concerns. Choose based on which trade-offs fit your workflow and budget.