ChatGPTExplain REM vs deep sleep for my exam
Send to Notebook
Acquired by
FschoolAI
FschoolAI Get everything into Gemini Notebook. And everything out.
Kortex is the research workspace for Gemini Notebook (formerly NotebookLM). Import from anywhere in one click, keep every notebook organized and backed up, and export anything to PDF or Markdown. It starts as a free Chrome extension.
4.4 from 394 Chrome Web Store ratings · 100,000+ users. Free plan, no card needed.
Animated product demo. Four sources, a ChatGPT chat, an X thread, a YouTube video and a highlighted web page, are each sent into a Gemini Notebook with one click. Kortex then tags the notebook and files it into a Research collection, an automation creates a study guide and an audio overview, and the notebook is exported as Markdown, PDF and a ZIP file.
Everything in green is what Kortex adds to Gemini Notebook
NewSchedules with Kortex MCP
Put your notebooks on a schedule.
Tell your AI assistant once. Every hour, day or week, Kortex asks your notebooks the question, saves the answer and turns it into an Audio Overview, so the brief is waiting when you sit down.
- Hourly, daily or weekly, on your own clock and time zone
- Ask and save, generate audio or study material, or run any workflow you have saved
- Runs from your browser while Chrome is open, with your own Google sign-in
See how schedules work Pro and Lifetime
Your AI assistant Kortex connected
Every Monday at 8, ask my Competitors notebook what changed this week. Save the answer and make it an Audio Overview I can listen to.
kortex.create_automation weekly · Mon 8:00 saved Done. Your Competitors brief runs every Monday at 8:00 and lands as a source plus an Audio Overview.
Competitors brief every Monday
- Monday, 8:00 2 pricing changes and a new integrations page Brief Audio
- Monday, 8:00 Nothing new this week, so a one-line note Brief Audio
- Monday, 8:00 3 new blog posts and a hiring push in sales Brief Audio
You love Gemini Notebook. You just spend half your time babysitting it.
It reads your sources brilliantly. Everything around that, getting research in, keeping it findable and getting it back out, is still done by hand.
Copy, paste, repeat.
Your research lives in ChatGPT, Claude, threads and forty open tabs. It reaches a notebook one paste at a time, and the formatting rarely survives.
Forty-seven notebooks. No folders.
Every notebook is a tile on one long page. No collections, no tags, and half of them are called Untitled notebook.
Nothing comes back out.
Want your sources, chats or notes as files? There is no download for that, so it leaves the way it came in: one selection at a time.
The same prompt, typed again.
Your best prompts live in a note somewhere else. Every session starts by finding them and retyping them.
Kortex fixes all four, inside the tab you already use.
Research 12
- Sleep and memory #neuro
- Urban heat islands #thesis
- Gut microbiome review #lit-review
- Climate policy papers #policy
- LLM evaluation methods #ai
- Coral reef survey #fieldwork
Coursework 9
- Organic chemistry 201 #finals
- Macroeconomics #exam-prep
- Constitutional law #week-6
- Statistics problem sets #exam-prep
- History of Rome #essay
- Spanish B2 prep #daily
Work 14
- Customer interviews Q3 #research
- Competitor pricing #strategy
- Onboarding docs #team
- Board meeting prep #monthly
- Hiring plan 2026 #people
- Launch retro notes #product
Reading list 31
- Philosophy of mind #books
- Podcast transcripts #listen
- Longform essays #weekend
- Sci-fi book club #club
- Newsletter clippings #inbox
- Recipes to try #home
Send it from wherever you found it.
Stop copying and pasting. Kortex adds a button where your research already happens, and puts it in the notebook you choose.
- From your AI chats
- A Send to Notebook button inside ChatGPT, Claude, Gemini, Perplexity and more. Prompts and replies arrive cleanly labelled.
- From any page
- Highlight a passage and right-click, or send the whole page. It lands as a source with its link.
- In bulk Pro
- Every open tab, a CSV of links, an RSS feed, or a crawler that follows a site’s links for you.
- From Google Docs Pro
- A Doc can change after you add it. One click re-syncs every Google Doc in a notebook.
- ChatGPT
-
Claude -
Gemini -
Perplexity -
X -
Reddit -
LinkedIn - YouTube
- Google Docs
- Grok
- Kimi
- Genspark
- OpenEvidence
- Any web page
A library, not a pile.
The Kortex Workspace gives every notebook a place. Sort them into collections, tag them, star them, and find anything in a second.
- Collections with subfolders and colours
- Tags for notebooks and for single sources
- Merge or compare notebooks side by side
- A prompt library you never retype
Set the rule once. It runs every time.
Rules connect something you already do, like adding a tag, to the steps that should follow. Kortex runs them in the background while you keep reading.
When
A notebook is tagged #work
- 1 Move it to the Work collection
When
A notebook is tagged #to-summarize
- 1 Generate a briefing doc
- 2 Generate flashcards
When
A notebook is tagged #paper
- 1 Add #to-summarize
- 2 Add #cite
When
A source comes from arxiv.org
- 1 Add it to the Papers notebook
When
A notebook enters CS224N
- 1 Create a Lecture summary note
- 2 Create a Key terms note
- 3 Create an Exam questions note
When
A notebook is tagged #listenlater
- 1 Generate its audio overview
- 2 Add it to the My Playlist feed
When
An episode finishes playing
- 1 Remove it from the feed
8 triggers and 11 actions to combine, or start from 9 ready-made rules. Included with Pro.
Your notebooks, in any format and any app.
Download sources, notes, chats and Studio artifacts as real files. Or turn Audio Overviews into a private podcast you can play on your commute.
Export anything
One notebook or a hundred. Whole notebooks, single sources, chats with or without your own messages.
- PDF sleep-and-memory.pdf Formatted, ready to print
- MD sleep-and-memory.md Headings kept, for Obsidian or Notion
- TXT sleep-and-memory.txt Plain text, for anything
- ZIP sleep-and-memory.zip Every source, note and chat at once
Listen anywhere
Kortex publishes your Audio Overviews to a private podcast feed. Subscribe once in Apple Podcasts, Spotify or Pocket Casts and new episodes just appear.
1,000 audio minutes included with Pro
NewKortex MCP
Now your AI assistant can work inside your notebooks.
Connect Claude, ChatGPT, Cursor, VS Code or any MCP client to your Gemini Notebooks. Ask across your whole library, fill notebooks straight from a chat, and reorganize hundreds of them with one sentence.
- 145+ notebook tools your assistant can call
- One config pasted into your AI client, or sign in with OAuth
- Your Google login stays in your browser. Kortex never stores your password or cookies.
Your AI assistant Kortex connected
Go through my inbox for every email from my landlord this year and put them in one notebook. Then tell me which repairs are still open.
-
kortex.create_notebook "Landlord 2026"created -
kortex.add_text_source 14 emails14 added -
kortex.ask_question "Which repairs are still open?"answered
Two repairs are still open: the bathroom extractor fan, reported on 3 March, and the back door lock, reported on 19 August. Everything else was marked fixed in a later email. 12
Loved by 100,000+ people who live in their notebooks.
200,000+ exports and 105,000+ imports so far. Here is what people wrote, in their own words.
The source downloader feature is stupidly good. Exporting entire notebooks into Markdown in one zip? That alone makes this extension worth it. I wish I had this months ago.
Kortex turns NotebookLM into an actual knowledge base instead of a fancy note dump. Highlighting text from any webpage and sending it straight in feels borderline magical.
Easy to use and works well! Just click on the NotebookLM button in a chat, and you will be prompted to add the chat to a new project or existing one. The newly created source is formatted very cleanly, with prompts and responses indicated clearly (no extra random characters, etc.)
Brilliant! Is going to save me hours. I can make all sorts of enquiries in Gemini and then Kortex consolidates them into a single notebook where I can review what I have found and make sense of it all. Thank you.
I am not very tech-savvy, but the Kortex extension is easy to use. I save recipes and cooking notes from different websites, and everything stays in one place. Earlier, I used to forget where I saw a recipe; now it's easy to find. Saves time and effort.
Oh man, happen to know this extension from XDR. I should give 6 stars! Just one click and all chats imported to NBLM.
Excellent extension for NotebookLM. Import various ai conversations over to ai seamlessly. Adds a convenient button to Gemini
Kortex solves such a practical problem. NotebookLM is powerful, but managing sources across multiple projects can get messy fast. Having a centralized way to organize, import, and export those sources with a click is exactly the kind of workflow improvement that saves hours over time.
Really awesome. Works. Does what it says.
Excellent Extension. Saves time and efforts. Worth giving it a try.
Infiltrating the world's best institutions
Free to start. Pro when your library grows.
4.4 from 394 Chrome Web Store ratings · 100,000+ users · 7-day money-back guarantee
Free
For trying Kortex and light use.
$0forever
Add to ChromeNo card needed.
- 10 imports a day from 15 sites
- 10 exports a day to PDF, Markdown and text
- Highlight text on any page and send it to a notebook
- Search every notebook and source
- 10 saved prompts and 5 folders
- Not included:
Sync across devices (stays in this browser) - Not included:
Kortex MCP for Claude, ChatGPT and Codex - Not included:
Bulk import from tabs, CSV, RSS, websites - Not included:
Automations and smart routing - Not included:
Notebook, source and note templates - Not included:
Highlights and notes on sources - Not included:
Podcast feed - Not included:
Google Docs sync - Not included:
Compare and merge notebooks - Not included:
Preview and edit before download
Pro
Most popular$4.92per month$59 billed yearly
That's 16¢ a day. You save $60.88 a year.
Black Friday: 30% off your first year of Pro Yearly with code BLACKFRIDAY26 at checkout. Until Monday, December 1.
Get Pro yearly7-day money-back guarantee. Cancel anytime.
Everything in Free, plus:
- No daily limits on imports, exports and captures
- Backed up and synced on every computer
- Bulk import tabs, CSV, RSS and whole sites
- Automations that file, tag and route new sources
- Templates for notebooks, sources and notes
- Highlights and notes on any source
- Podcast feed with 1,000 minutes that never expire
- Google Docs sync and one-click chat re-sync
- Kortex MCP for Claude, ChatGPT, Cursor and Codex
Pay with the email you sign in to Kortex with, so Pro lands on your account.
Lifetime
Pay oncePro for good, for one payment.
$200onceNothing renews
Get Pro for life7-day money-back guarantee.
Everything in Pro, plus:
- Every future update to the extension
- Priority for new product releases
- 2,000 podcast minutes, double Pro
- Unlimited Kortex MCP with fair use
- No renewals and no price rises
Teams
For labs, classes and small teams who share notebooks.
$12per seat, per monthBilled yearly, 3 seats minimum
Everything in Pro, plus:
- Shared prompt libraries
- Team notebooks
- Admin dashboard for seats and usage
- Priority support
We set it up with you.
- 7-day money-back guarantee
- Cancel anytime, keep your library
- Secure checkout by Dodo Payments
- Lower prices in many countries
- A real reply within 1 business day
“Brilliant! Is going to save me hours. I can make all sorts of enquiries in Gemini and then Kortex consolidates them into a single notebook where I can review what I have found and make sense of it all. Thank you.”
Compare every feature
| Feature | Free | Pro and Lifetime | Teams |
|---|---|---|---|
| Daily use | |||
| Imports (chats, pages, YouTube, 15 sites) | 10 a day | Unlimited | Unlimited |
| Exports to PDF, Markdown and text | 10 a day | Unlimited | Unlimited |
| Full-page captures | 3 a day | Unlimited | Unlimited |
| Saved prompts | 10 | Unlimited | Unlimited |
| Folders and source views | 5 each | Unlimited | Unlimited |
| Notebook merges | 3 | Unlimited | Unlimited |
| Search across notebooks and sources | ✓ | ✓ | ✓ |
| Pro | |||
| Library backed up and synced across devices | This browser only | ✓ | ✓ |
| Bulk import: open tabs, CSV, RSS, whole websites | – | ✓ | ✓ |
| Automations (8 triggers, 11 actions) | – | ✓ | ✓ |
| Study guides, flashcards and briefings on filing | – | ✓ | ✓ |
| Google Docs sync | – | ✓ | ✓ |
| Podcast feed in Spotify and Apple Podcasts | – | 1,000 minutes (Lifetime: 2,000) | 1,000 minutes |
| Generate all, then preview and edit before download | – | ✓ | ✓ |
| Create notebooks from selected sources | – | ✓ | ✓ |
| Smart routing: new sources go to the right notebook | – | ✓ | ✓ |
| One-click quick import from the side panel | – | ✓ | ✓ |
| Notebook, source and note templates | – | ✓ | ✓ |
| Highlights and notes on sources | – | ✓ | ✓ |
| Compare notebooks side by side (source diff, sync, merge) | – | ✓ | ✓ |
| Re-sync a saved AI chat after it changes | – | ✓ | ✓ |
| Workspace stats: tags, collections, favorites, podcasts | – | ✓ | ✓ |
| Kortex MCP (Claude, ChatGPT, Cursor, Codex) | – | Included (Lifetime: unlimited, fair use) | Included |
| Priority for new product releases | – | Lifetime | – |
| Teams | |||
| Shared prompt libraries and team notebooks | – | – | ✓ |
| Admin dashboard for seats and usage | – | – | ✓ |
| Priority support | – | – | ✓ |
| Email support from the people who build Kortex | Best effort | Reply within 1 business day | Priority |
Kortex MCP connects Claude, ChatGPT, Cursor and Codex to your notebooks, and comes with Pro and Lifetime. See how it works.
Need SSO, invoicing, zero-retention terms or an SLA?
Questions people ask before installing
More answers on the support page, or write to us.
What is Kortex?
Kortex is a browser extension that enhances Gemini Notebook by adding export functionality, prompt management, and source viewing features. You can export notebook sources in multiple formats (PDF, Markdown, Text, ZIP), save and organize prompts, and create custom source views.
Is Kortex free?
Yes. The free Basic tier includes 10 exports per day, 10 imports per day, 5 source views per day, and 10 saved prompts in total. For unlimited everything plus Google Docs Sync, source deletion, and all automations, we offer Pro ($9.99/month, $59/year, or $200 once for lifetime).
What does Pro Lifetime include?
One $200 payment, and Pro never renews. You get everything in Pro plus every future update to the extension, 2,000 podcast minutes (double Pro; more are $10 per 500), priority for new product releases, and unlimited Kortex MCP with fair use. Lifetime lasts for as long as Kortex is maintained and Gemini Notebook keeps working with it, and has the same 7-day money-back guarantee.
What exactly are the free tier limits?
On the free Basic tier: 10 exports per day, 10 imports per day, 5 source views per day, and 10 saved prompts in total. Exports, imports, and source views reset every day. Saved prompts are a total cap rather than a daily one, so you can delete old prompts to free up slots. Pro removes all of these limits.
Which browsers are supported?
Kortex currently supports Google Chrome, Microsoft Edge (Chromium-based), Brave Browser, and other Chromium-based browsers. Firefox support is coming soon.
What formats can I export to?
You can export to PDF (formatted documents), Markdown (intelligently formatted with hierarchy detection), Text (plain text), and ZIP (compressed archives).
Do podcast minutes renew each month?
No, the 1,000 podcast audio minutes included with Pro are a one-time allocation rather than a monthly refresh. They are tied to the audio you currently host, so removing a podcast from the feed returns its minutes to your balance. If you need more, extra minutes cost $10 per 500 LIFETIME minutes.
Is my data secure?
Yes! Kortex uses Google OAuth for authentication, Firebase for secure backend services, and Firestore for cloud storage. Any data Kortex collects is only used to improve product experience; you may choose to opt out at any time.
Give your notebooks a home.
Install Kortex in under a minute. It works inside the Gemini Notebook you already use, free forever for the basics.
Join 100,000+ people. Works in Chrome, Edge, Brave and other Chromium browsers.
