Gemini Notebook (formerly NotebookLM) vs Obsidian

Gemini Notebook (formerly NotebookLM) vs Obsidian sounds like a fair fight, since both promise a smarter way to work with what you know. In fact, they do opposite jobs. Obsidian is a note-taking app that keeps plain Markdown files on your own device. Gemini Notebook is a research assistant that reads the sources you add and answers with citations. So which one do you need? Probably both, at different stages of the same work. Here’s how they compare, and how to connect them.

Key Takeaways

• Obsidian keeps your notes as Markdown files in a folder you own.
• Obsidian gets AI only from community plugins; Gemini Notebook builds it in.
• Obsidian is free, and Sync starts at $4 a month billed yearly (Obsidian, 2026).
• Research in Gemini Notebook, then keep lasting notes in Obsidian.

What’s the difference between Gemini Notebook and Obsidian?

Obsidian is where you write and keep notes, and Gemini Notebook is where you question sources. Obsidian “stores your notes as Markdown-formatted plain text files in a vault” (Obsidian Help, 2026). A vault is simply a folder on your device, so you can open and edit the same notes with other text editors and file managers. Nothing locks you in. A free Gemini notebook, in contrast, lives in Google’s cloud and answers from up to 50 sources (Gemini Notebook Help, 2026). It keeps those sources online and turns them into answers, summaries and study material. As a result, one tool is a library you own, while the other is a reading room you visit with a pile of documents. Importantly, that difference shapes everything else below.

Is one a replacement for the other? Not really. Obsidian has no AI of its own, and Gemini Notebook’s notes aren’t meant to be a linked library you keep for years. Our Gemini Notebook alternatives guide puts both in the wider field.

Plenty of people already use both. When we analyzed 776 answers to the Kortex MCP waitlist survey, Obsidian came up by name in 16 of them, one more than Notion. The answers came in from September 19 to October 1, 2026, and 72 people asked to get notes and outputs back out of their notebooks. One described the chore plainly: “I manually export or copy the content and reorganize it into my local Obsidian vault”. Another simply wrote “Sync my NotebookLM with my Obsidian!” Search data shows the same pairing. When we analyzed 1,451 Google autocomplete suggestions in October 2026, people typed “notebooklm obsidian integration”, “notebooklm obsidian plugin” and “notebooklm obsidian workflow”. In other words, the real question is usually how to connect them.

Does Obsidian have AI like Gemini Notebook?

Not built in. None of Obsidian’s 30 core plugins is an AI assistant (Obsidian Help, 2026), so AI comes from community plugins. Gemini Notebook, conversely, is built around AI, and its chat gives “grounded information based on your sources with clear in-line citations” (Gemini Notebook Help, 2026). That grounding has independent support. In a 2025 study of a 300-document reporting task, NotebookLM hallucinated in 13% of outputs, against about 40% for ChatGPT and Gemini (Hagar, Agustianto & Diakopoulos, 2025). That said, no Obsidian plugin was part of that test, and NotebookLM still made mistakes. Its typical slip was “interpretive overconfidence”, reading more into a source than it says. Therefore, click the citation behind any strong conclusion before you repeat it.

The plugin choice is huge. Obsidian’s official community plugin list on GitHub has more than 8,000 entries (Obsidian on GitHub, 2026). For example, Smart Connections finds related notes with “a local embedding model” and needs “No API key”. Copilot by Logan Yang, meanwhile, runs “AI agents such as Claude Code, Codex, and OpenCode inside your vault”. Some plugins run fully on your device, and others call a cloud model. However, you build the setup yourself. Obsidian’s help warns that community plugins “run third-party code on your behalf that could potentially do harm” (Obsidian Help, 2026). You also pick the model and settings. As a result, two vaults with the same notes can give very different answers. Want answers you can check against a source right away? Gemini Notebook does that with no setup at all.

Gemini Notebook vs Obsidian at a glance

The biggest split is where your files live. Obsidian keeps a vault anywhere your system allows and syncs through Obsidian Sync, Dropbox, iCloud, OneDrive or Git (Obsidian Help, 2026). Gemini Notebook, in contrast, stores each source in Google’s cloud, at up to 500,000 words per source (Gemini Notebook Help, 2026).

	Gemini Notebook	Obsidian
What it is	Research assistant grounded in your sources	Markdown note-taking app.
Where your data lives	Google’s cloud, in your Google account	Plain text files in a folder you choose.
AI	Built in, with inline citations	Community plugins only.
What it makes	Audio and Video Overviews, mind maps, reports, flashcards, quizzes, slides	Linked notes, Canvas boards, graph view and Bases.
Capacity	50 sources per notebook free, up to 600 on Ultra	Your disk; Sync holds 1 GB or 10 GB, up to 100 GB on Plus.
Offline	Needs a connection; the mobile app downloads Audio Overviews	Works offline, since the files are local.
Price	Free, with paid Google AI plans	Free, with optional Sync and Publish.
Best for	Understanding and studying a set of sources	Notes you keep and link for years.

Read the table as two halves of one job. Gemini Notebook is strongest while you’re still reading and asking questions. Obsidian, on the other hand, is strongest once you know what you think and want to keep it. Weighing a cloud workspace instead? Our Gemini Notebook vs Notion breakdown covers that trade-off.

Where does your data live, and which is more private?

On your device with Obsidian, and in Google’s cloud with Gemini Notebook. Obsidian’s privacy page says “All data is saved locally on your device and is never sent to our servers” and “We do not collect any telemetry data” (Obsidian, 2026). Sync adds AES-256 end-to-end encryption. Google, meanwhile, says content in Gemini Notebook “will not be used to directly train our foundational AI models, unless you choose to provide feedback” (Gemini Notebook Help, 2026). Work and school accounts go further: their uploads, queries and responses aren’t reviewed by humans or used to train AI models, even with feedback. The trade-off, however, is custody. Your sources sit in Google’s cloud, not in a folder you control. OneNote users face a similar choice, covered in Gemini Notebook vs OneNote.

Backups differ too. Obsidian Sync keeps version history for 1 month on Standard and 12 months on Plus (Obsidian Sync, 2026). In addition, the File recovery core plugin takes regular snapshots on your device. Similarly, plain-text files are easy to back up with tools you already use, such as Git or iCloud. Gemini Notebook, in contrast, offers no such safety net for deleted notes. Google says “there’s currently no way to recover deleted notes” (Gemini Notebook Help, 2026). Consequently, it pays to keep your own copy of anything you’d hate to lose. Native export helps a little, since a note can go to Google Docs, one at a time. A Markdown copy in your vault, however, survives whatever happens to the notebook.

What do Gemini Notebook and Obsidian cost?

Both are free to start. Obsidian is “Free without limits” for personal and commercial use. The paid extras are optional: Sync costs $4 a month and Publish $8 a month per site, billed yearly (Obsidian, 2026). A free Gemini Notebook account, likewise, includes 100 notebooks with 50 sources each (Gemini Notebook Help, 2026).

Plan	Price (yearly / monthly billing)	What you get
Obsidian app	Free	Personal and commercial use.
Obsidian Sync Standard	$4 / $5 a month	1 synced vault, 1 GB, 5 MB max file, 1 month of history.
Obsidian Sync Plus	$8 / $10 a month	10 vaults, 10 GB, 200 MB max file, 12 months of history.
Obsidian Publish	$8 / $10 a month per site	Your notes as a website.
Obsidian Commercial license	$50 per user a year	Optional, to support development.
Gemini Notebook	Free	100 notebooks, 50 sources each.
Google AI plans	From $4.99 a month	100 sources per notebook on Plus, 300 on Pro, up to 600 on Ultra.

Students, faculty members and nonprofit employees get 40% off Obsidian Sync and Publish (Obsidian, 2026), which helps if you sync a vault between a laptop and a phone. Gemini Notebook’s paid tiers come inside Google AI plans instead, which our Plus vs Pro vs Ultra guide compares. So do you need Sync at all? Not if you already sync the vault through iCloud or Git, so the pair can cost nothing extra. Additionally, Obsidian’s commercial license is optional, so work use stays free as well. At these prices, Sync Standard adds $48 a year and Plus adds $96. One catch: Standard caps each file at 5 MB, while Plus allows 200 MB. Therefore, check file sizes before you move source PDFs into your vault.

How do you use Gemini Notebook with Obsidian?

Markdown makes the two tools fit together. Gemini Notebook accepts Markdown (.md) files as sources, up to 500,000 words each (Gemini Notebook Help, 2026). Similarly, Google Docs can export a Doc as Markdown from File > Download (Google Workspace Updates, 2024). As a result, text can travel both ways in the same format. Here’s how to choose, task by task:

• Reading papers, reports or course material and need cited answers? Use Gemini Notebook.
• Studying with flashcards, quizzes and Audio Overviews? Use Gemini Notebook.
• Keeping a lifelong, linked library of your own notes? Use Obsidian.
• Want your files on your own device and offline? Use Obsidian.
• Need both? Research in Gemini Notebook, then keep notes in Obsidian.

Here’s a native route that needs no extension. Export a note to Google Docs: hover over it in the Sources panel, select More, then Export to Docs (Gemini Notebook Help, 2026). A report exports from its three-dot menu in the Studio panel (Gemini Notebook Help, 2026). Then, in Google Docs, use File > Download > Markdown and drop the .md file into your vault. It works in reverse, too. Specifically, you can upload an Obsidian note as a Markdown source when you want Gemini Notebook to reason over it. A simple loop looks like this:

1. Add papers, pages and videos to a notebook, and ask your questions there.
2. Export the reports and answers worth keeping as Markdown.
3. Drop the files into your vault, then link and tag them like any note.
4. Send finished Obsidian notes back as sources when you want AI help.

One tip before you start: “Gemini Notebook can’t access information across multiple notebooks at the same time” (Gemini Notebook Help, 2026). Accordingly, keep one notebook per project or course. If your notebooks multiply faster than your notes, our guide to organizing dozens of notebooks will help.

How does Kortex move notebook work into Obsidian?

Kortex exports a notebook in the format Obsidian reads natively, and we built those exports for exactly this round trip. Download every source as Markdown in a ZIP, export every Studio note and artifact at once, or save a chat as Markdown. Kortex users have run 200,000+ exports (Kortex, 2026). Unzip the files into your vault, and Obsidian picks them up, since a vault is just a folder of Markdown files. For instance, a whole course notebook can become a folder of Markdown notes in one download. Notably, copying a chat as Markdown is free and never counts toward a limit. The free plan includes 10 exports a day, and Pro, at $9.99 a month, removes the cap (Kortex pricing, 2026). Our Gemini Notebook export guide walks through each option.

Want the notes to arrive already linked? With Kortex MCP, Claude Code or Codex can read your notebooks, save each note into your vault as a Markdown file and link it to the notes you already have. Kortex MCP is included with Kortex Pro and Lifetime. Our guide to moving Gemini Notebook notes into Obsidian and Notion walks through it.

So research in Gemini Notebook, keep lasting notes in Obsidian, and let Kortex move the Markdown between them.

Frequently asked questions

Is Gemini Notebook better than Obsidian?

They do different jobs. Gemini Notebook reads up to 50 sources per free notebook and answers with inline citations. Obsidian, on the other hand, stores your own notes as Markdown files on your device and is free for personal and commercial use. Most people get the best results using Gemini Notebook for research and Obsidian for notes.

Can Gemini Notebook replace Obsidian?

Not for notes you keep. Gemini Notebook answers questions about the sources in one notebook, but it isn’t built as a linked library, and Google says deleted notes can’t be recovered. Obsidian keeps your notes as Markdown files on your device, with links and a graph view. Use Gemini Notebook to research and Obsidian to keep what you learn.

Does Obsidian have built-in AI?

No. None of Obsidian’s 30 core plugins is an AI assistant, so AI comes from community plugins such as Smart Connections or Copilot. Obsidian warns that community plugins run third-party code on your behalf, so check who made a plugin and what it connects to before you install it.

Can I import Obsidian notes into Gemini Notebook?

Yes. Gemini Notebook accepts Markdown (.md) files as sources, and each source can hold up to 500,000 words. Upload the notes you want the AI to use, or paste text directly. A free notebook holds 50 sources, so merge related notes into one file if you have many.

How do I export Gemini Notebook to Obsidian?

Natively, export a note or report to Google Docs, download it from Docs as Markdown, and drop the file into your vault. For sources, notes and chats in bulk, Kortex exports them as Markdown or in a ZIP, with 10 exports a day on its free plan.

How much does Obsidian cost?

The app is free for personal and commercial use. Obsidian Sync costs $4 a month billed yearly for 1 vault and 1 GB, or $8 for 10 vaults and 10 GB. Publish costs $8 a month per site, and students get 40% off both.

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Editorial note: fact-checked against the official help pages and docs linked above on October 26, 2026. Spotted something out of date? Contact us and we will fix it, or read more about Kortex.