Criterion Microsoft 365 Copilot Gemini Notebook (formerly NotebookLM)
CategoryEnterprise AutomationAI Research Tools
In one sentenceMicrosoft's AI assistant inside Word, Excel, PowerPoint, Outlook and Teams, grounded in your organisation's work data.Google's source-grounded research notebook, renamed from NotebookLM to Gemini Notebook in July 2026.
Problem it solvesKnowledge workers spend much of their day on email, meetings and documents that could be drafted or summarised automatically.Making sense of many long documents is slow, and general chatbots may answer from outside your material.
Free planYesYes
Developer APIYes — docsNo
Open sourceNoNo
PlatformsWindows, macOS, Web, iOS, Android, Microsoft TeamsWeb, iOS, Android, Gemini app
Pricing (summary)Copilot Chat is included with eligible Microsoft 365 plans. Microsoft 365 Copilot for enterprise is $30 per user/month paid yearly or $31.50 paid monthly (annual commitment). For small businesses, the Copilot Business add-on is $21 per user/month annually ($18 promotional first year through 31 Dec 2026) or $25.20 monthly, and bundles with Business Standard or Premium are available.
Checked 2026-10-19		Free with a Google account (100 notebooks, 50 sources each). Higher limits come with Google AI Plus, Pro and Ultra subscriptions; Google's plan page did not display prices in the fetched version, so check Google One for current amounts.
Checked 2026-10-19
Strengths
  • Deep integration with Microsoft 365
  • Enterprise security and permissions
  • Copilot Chat at no extra cost
  • Strong grounding in user-provided sources
  • Free tier is usable for real projects
  • Integrated with Google's Gemini ecosystem
Limitations
  • Requires a qualifying Microsoft 365 licence
  • Add-on cost per user
  • Trials require a credit card and convert to paid
  • Free tier capped at 100 notebooks and 50 sources per notebook
  • Code execution limited to higher paid tiers at launch
  • Name change may cause confusion with notebooks inside the Gemini app