Our Verdict
Based on ratings, features, pricing, and capabilities, Microsoft Copilot edges ahead in this comparison. Microsoft Copilot offers better value and broader platform support.
Feature
NotebookLM
Microsoft Copilot
Rating
⭐ 4.9/5
⭐ 4.6/5
Free Plan
Starting Price
Free
$20/mo
Monthly Visits
45.0M
290.0M
API Support
Open Source
AI Capabilities
Mobile App
Desktop App
Browser Extension
Integrations
4 apps
5 apps
Team Size
ENTERPRISE
ENTERPRISE
NotebookLM Pros & Cons
Pros
- Zero hallucination beyond your provided sources
- Audio Overview podcast is shockingly natural and informative
- 100% free with your Google account
Cons
- Only answers based on uploaded sources, no general web search
- Cannot edit audio script directly prior to synthesis
Microsoft Copilot Pros & Cons
Pros
- Deep enterprise security and compliance
- Built natively into Windows, Word, and Excel
- Free web version includes GPT-4o access
Cons
- Microsoft 365 Copilot add-on requires business license
- Sidebar browser interface can feel crowded
NotebookLM Key Features
- Audio Overview (Two-Host Deep Dive Podcast)
- Strict Source-Grounded Answering
- Upload up to 50 Sources per Notebook
- Instant Study Guides & FAQs
Microsoft Copilot Key Features
- Windows 11 Native Integration
- Microsoft 365 Copilot for Office
- DALL-E 3 Image Generation
- Commercial Data Protection