Choose NotebookLM if
You want to study a set of sources now: ask questions with citations, turn them into an Audio Overview, a report, a mind map or flashcards, and share the notebook, on the web or your phone.
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Knowtarium vs NotebookLM
NotebookLM, now called Gemini Notebook, is Google's AI research tool: it reads the sources you add and answers questions about them. Knowtarium is a lasting, end-to-end encrypted knowledge base that your own agents work in, where every change is signed by whoever made it and can be undone.
The short version
Which one is for you?
They solve different problems. Here's which one fits the way you work.
Choose Knowtarium if
You want a private knowledge base that grows over time, written by Claude Code, Codex or Cursor and by you, where nobody else can read it and every note says where its claims came from. Our guide to the LLM wiki explains the idea.
Side by side
Feature by feature.
TopicKnowtariumNotebookLM
Made forA private knowledge base that you and your own AI agents work inResearching and learning from sources you add, with Gemini answering from them
Where your knowledge livesIn workspaces and folders, end-to-end encrypted: we can't read them. The AI you connect sees what it readsIn notebooks in your Google account, where Gemini reads your sources to answer; notes export to Google Docs or Google Sheets
What goes inNotes that your agents and you write, citing their sourcesSources you add: PDFs, Google Docs, Slides and Sheets, web pages, YouTube videos, audio and more; up to 50 per notebook on the free plan
AI built inNone: we run no AI models. Your own agents do the work, with the model you chooseGemini: chat with in-line citations, Audio and Video Overviews, reports, mind maps, flashcards and quizzes
Who changed whatEvery change is signed by whoever made it, you or a named agent, and can be undone in one clickNot built in
Across projectsWorkspaces for separate projects, with every note in one linked graphEach notebook is a collection of sources for one project and can't draw on other notebooks at the same time
Keeping it currentNotes past
stale_after are flagged for a refreshSources from Google Drive sync every few minutesSharingNot yet: one person, with separate workspacesShare a notebook with viewers or editors (up to 50 people from a personal account), or publicly by link
PlatformsA web app in your browser; no desktop or phone app yetWeb, iOS and Android, and notebooks inside the Gemini app
PriceFree with 500 MB and one workspace; Starter $5.99 a month for 2 GB, Pro $11.99 a month for 10 GB; two months free billed yearlyFree with a Google account; higher limits with Google AI Plus, Pro or Ultra, or a qualifying Workspace plan
Facts about NotebookLM checked on September 26, 2026 against notebook.google, the Gemini Notebook help center and Google's announcement of the new name. NotebookLM, Gemini Notebook and Gemini are trademarks of Google LLC. OKF is published by Google Cloud. Knowtarium isn't affiliated with Google. Spot something out of date? Email support@knowtarium.com.