The short version

HokAI lists four AI note-taking tools, and none solve the same problem. Pick Gemini Notebook for research grounded in your own documents, Mem for scattered personal notes, Glasp for highlighting other people's content, and Brain2 only once it ships past its Mac-only waitlist.

Best AI Note-Taking Tools in 2026: Brain2, Glasp, Mem, and Gemini Notebook Compared

A four-person startup spent an afternoon in July 2026 rebuilding a decision trail from forty open browser tabs, because nobody's notes app had been capturing anything automatically while the actual work happened.

HokAI lists four AI note-taking tools: Brain2, Glasp, Mem, and Gemini Notebook, Google's mid-2026 rename of NotebookLM. None of them are really substitutes for one another.

The axis that separates them isn't which one has the smartest model, it's what triggers capture in the first place: your own screen activity, someone else's webpage, your own scattered thoughts, or a document you deliberately hand it. Picking the wrong axis is exactly what left that founder rebuilding forty tabs from memory, and it's the same mistake a generic top-ten list will walk a reader straight into.

How to Choose Between Four Tools That Don't Actually Compete

Start with what you are trying to capture, not which tool ranks highest in a listicle. Four questions do most of the sorting.

What triggers the capture? Brain2's passive capture logs your Mac screen, clipboard, and AI chat history in the background with no manual input. Glasp's highlighter model only saves what you deliberately mark on a webpage, PDF, or YouTube video. Mem catches whatever you type or say into it: notes, voice memos, half-formed ideas. Gemini Notebook works only from documents you upload. It will not notice anything you didn't hand it.

Does the free tier survive your real volume? Mem's free plan stops at 25 notes and 25 chat messages a month. Glasp's free plan caps at 30 PDF uploads, 20 AI chat credits, and 30 minutes of audio transcription monthly. Gemini Notebook is free for any Google account with no published note cap.

Does the output need to stay private, or can it be social? Glasp's free tier defaults to public highlights, and its social feed shows what other readers marked on the same article, a feature none of the other three offer or want.

Does it need to talk to tools you already use? Glasp exports to Notion, Obsidian, Roam Research, and Evernote as Markdown, HTML, CSV, or JSON. Gemini Notebook keeps everything inside its own notebooks. Nothing exports out, and separate notebooks can't reference each other even when their sources overlap.

One more question that's easy to skip: how much do you want to organize later? Two of the four remove that decision entirely. Mem and Gemini Notebook both sort on the fly, surfacing what's relevant instead of asking anyone to file it by hand. Glasp and Brain2 leave more manual work behind them, a highlight library and a raw activity log respectively, and both reward someone willing to search rather than browse.

Gemini Notebook Is the Default, and Mostly Deserves It

Google renamed NotebookLM to Gemini Notebook on July 16, 2026, according to 9to5Google's report on the change, and the old notebooklm.google address now redirects straight to notebook.google. Every existing notebook, source, and Audio Overview carried over unchanged.

The switch shipped alongside a real capability jump: each notebook now gets a secure cloud computer that can write and execute code against its own sources, not just summarize them. Data analysis that used to mean exporting sources into a spreadsheet can now run inside the notebook itself, against the same grounded sources it already trusts. Google says the upgrade is rolling out gradually through the rest of 2026, so not every account sees it on the same day.

The reach is the headline number. Google says Gemini Notebook has reached more than 30 million people and 600,000-plus organizations. It is free with any Google account, and its source-grounded answer model will say it doesn't know rather than guess when a source doesn't cover the question, a genuinely rare trait among AI tools in 2026.

Paid access rides on Google's own subscription ladder, restructured at I/O 2026: AI Pro runs $19.99 a month, and AI Ultra now starts at $99.99, with a second tier at $199.99, down from a single $249.99 tier before the cut.

The catch is the walled garden. Gemini Notebook has no offline mode on any plan, and notebooks cannot cross-reference each other, so overlapping sources uploaded to two different notebooks never connect. For a reader whose real problem is a rolling stream of scattered material rather than a fixed document set, that limit matters more than the user count.

Mem Wants to Replace Your Folders, Not Your Notebook

Mem skips folders and tags entirely. Everything you type or dictate goes into one pool, and an AI layer connects related notes and surfaces them by context instead of by where you filed them. Mem Chat, the built-in assistant, answers only from your own notes rather than the open web, which keeps its output tied to what you actually wrote rather than what the internet thinks.

The free plan caps out fast: 25 notes and 25 chats per month is not much room to work with. Mem's own pricing page requires a modern browser session and returned no static price during this research, but review sites that tested it this year price Mem's paid tier somewhere between $12 and $14.99 a month, cheaper on annual billing. Take that range as reported rather than vendor-confirmed.

One thing worth stating plainly: Mem is not Mem0. Mem is the consumer note-taking app described here. Mem0 is a separate open-source memory API that developers plug into their own AI agents, with no note-taking interface of its own. The near-identical name causes exactly the confusion you'd expect, enough that at least one 2026 review had to write an entire post just to sort the two apart.

Glasp Is Built for People Who Read for a Living

Glasp is a highlighter first. Color-coded highlights save straight from any webpage, PDF, or YouTube video, and a single click generates a summary using whichever model you've picked: ChatGPT, Claude, Mistral, or Gemini. Its social feed is the genuine differentiator here. It surfaces what other readers highlighted on the same article, and following specific people whose annotations you trust turns reading into something closer to a shared habit than a solitary one.

Pricing rose on May 1, 2026, and the free tier stayed put: unlimited public highlights, 3 basic YouTube summaries a day, and 30 PDF uploads a month. Glasp Pro went from $12 to $15 a month, or $150 a year if paid annually, an effective $12.50 a month. It adds unlimited private highlights, 1,000 YouTube summaries a month, and daily auto-sync to Notion.

Unlimited rose from $30 to $36 a month, or $360 a year annually, and removes every cap, including 5,000 monthly summaries and 1,500 minutes of audio transcription.

The tradeoff is that public-by-default sharing doesn't suit anyone handling sensitive material, and private highlighting is a paid feature, not a free one.

Brain2 Is a Bet on Passive Capture, If It Ships on Time

Brain2 is the only tool here that captures nothing you deliberately did. It silently records screen text, clipboard contents, and your Claude, ChatGPT, and Cursor conversations in the background, then turns a full day of that activity into a one-click standup report. Everything lives in a local SQLite database on the Mac itself. An exclusion list lets you block banking apps or password managers from capture entirely.

That positioning is a direct answer to Rewind AI, the closest precursor to this idea. Rewind rebranded to Limitless, was acquired by Meta, and had its Mac app disabled on December 19, 2025, ending cloud-based screen recording for its users less than a year before Brain2's own planned launch.

Brain2's $6.99 tier doesn't start until launch. It is still pre-launch as of this writing, macOS 13 and later only, with Windows and Linux support merely under consideration. Waitlist signups get three months free once it ships, after which the plan runs $6.99 a month or $59.99 a year, about 29% cheaper than paying monthly. There is no team tier and no public user base yet, so treat every claim above as a roadmap, not a review.

The pitch lands hardest for anyone who has already decided cloud-based activity logging is a risk they won't take. A tool that never phones home removes an entire category of vendor-trust question that the other three tools in this guide still have to answer, whatever their individual privacy policies say.

Mem vs. Gemini Notebook: The Two People Actually Cross-Shop

These are the two tools most likely to end up in the same shortlist, because both position themselves as a general AI note-taking layer rather than a niche capture tool.

For a two-person team compiling client research from PDFs and reports, Gemini Notebook's free tier wins outright. It costs nothing beyond a Google account, cites its sources inline, and Google's own 30-million-user figure is a scale Mem cannot claim.

For someone whose actual workflow is voice memos and half-written ideas typed into a phone late at night, Mem's free cap is still the better starting point. Gemini Notebook has nothing to say about an idea that isn't already a document, and Mem's chat-first capture is built for exactly that kind of unstructured input.

Run the cost forward a year and the gap widens rather than closes. A Mem Pro subscription priced near the middle of the reported range runs roughly $155 to $180 annually, before any team seats get added. Its free tier holds at 300 notes and 300 chat messages across twelve months, a volume a busy solo operator can clear inside a single active quarter.

Google's free tier costs nothing at any volume, at least until a workflow needs the higher usage limits that only a paid AI Pro or AI Ultra subscription unlocks.

Where the Obvious Pick Breaks Down

Gemini Notebook's free price tag and 30-million-user base make it the safe recommendation for almost anyone asking which AI note tool to use. That recommendation breaks for two specific readers.

The first is anyone who needs to work without a live connection. Nothing here promises offline access for Gemini Notebook on any tier, full stop. The second is anyone whose material isn't a fixed set of documents at all, someone whose real input is a rolling stream of screen activity or scattered voice notes that never gets deliberately uploaded anywhere. Gemini Notebook cannot ingest what it was never handed, no matter how good its answers are once it has something to work with.

Who Should Skip This Category Entirely

Meeting transcription is a different job. Anyone whose real need is a bot joining a call, transcribing it live, and producing action items should look at Otter.ai or a dedicated meeting notetaker instead. None of the four tools here join a call.

Anyone who already lives inside a single all-in-one workspace, writing docs, tracking projects, and taking notes in the same place, is probably better served staying inside Notion's own AI features than adding a fifth app to the stack.

A note-taking habit that's mostly copy and search doesn't need an AI layer at all. Whatever notes app already ships with the operating system does that job for free, with no monthly bill attached, and a fifth subscription on an already crowded stack rarely earns its keep before the first billing cycle ends.

The one thing worth watching through the rest of 2026 is whether Brain2 actually ships. If it lands on time with a Windows build and keeps its local-only model intact, it undercuts every cloud tool in this guide on the single promise none of them can make: that a full day of captured activity never leaves the machine it happened on.

Frequently asked questions

Is NotebookLM the same product as Gemini Notebook?

Yes. Google renamed NotebookLM to Gemini Notebook on July 16, 2026, keeping every existing notebook, source, and Audio Overview intact. The address notebooklm.google now redirects to notebook.google, and the update added a secure cloud computer that lets each notebook write and execute code against its own sources. Pricing and the underlying source-grounded answer model did not change in the switch.

Is Mem the same product as Mem0?

No, and the near-identical name causes real confusion among buyers. Mem is a consumer note-taking app that auto-organizes personal notes and voice memos through an assistant called Mem Chat. Mem0 is a separate open-source memory API that developers plug into their own AI agents, with no note-taking interface at all.

Can any of these four tools work offline?

Brain2 is the only one built around local storage, saving every capture to an on-device SQLite database on macOS with nothing sent to a server. Glasp, Mem, and Gemini Notebook all require an active connection, and Gemini Notebook specifically has no offline mode on any plan. Brain2 itself remains in pre-launch waitlist status, so it is not something you can install today.

How much do the free tiers actually let you do?

Gemini Notebook is free for any Google account with no note or source cap published. Mem's free plan stops at 25 notes and 25 chat messages a month, and Glasp's free plan caps out at 30 PDF uploads and 20 AI chat credits a month. Brain2 has no permanent free tier; waitlist signups get three months free before the $6.99 monthly plan starts.

Which of these tools should a small team pick first?

Start with whichever one matches the moment you're actually trying to capture, not the vendor with the biggest user count. A team compiling research from PDFs and reports should start with Gemini Notebook, since it's free and cites sources inline. A team whose real problem is scattered voice memos and half-written ideas should start with Mem instead, free-tier caps permitting.

Covered in this guide

Mem: Your AI Thought Partner that captures, organizes, and surfaces information automatically
Gemini Notebook: AI-powered research assistant that grounds insights in your sources
Brain2: Brain2 is a local-only Mac app that silently logs your screen, clipboard, and AI chats to auto-generate daily standup reports.
Glasp: Social web and PDF highlighter for researchers and learners
Mem0: Mem0 gives AI agents persistent memory through one API, scoring 92.5 on the LoCoMo benchmark with its V3 algorithm released in 2026.
Notion: Your AI everything app: All your tools and work in one unified workspace.
Otter.ai: AI Notetaker that builds your knowledge base with transcription, summaries, and AI Chat
Rewind AI: Search engine for your life—capture, search, and recall everything you see, say, or hear on your device.

Sources

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