Kortex adds a send button to posts on X, Reddit and LinkedIn, to YouTube and to any passage you highlight, so the research for your next piece ends up in one Gemini Notebook.
100,000+ users, rated 4.5 in 410 Chrome Web Store ratings.
Writers and creators use Kortex, a Chrome extension for Gemini Notebook (formerly NotebookLM), to save posts from X, Reddit and LinkedIn, YouTube videos and highlighted passages into a notebook per project as they browse. Then they ask that notebook for angles, outlines and briefs grounded in what they saved, and export the research as Markdown to wherever they draft.
The idea arrives while you’re scrolling. Kortex makes saving it a single click.
The thread that sparked the idea is gone from your feed by tonight.
X threads, Reddit posts with their top comments and LinkedIn posts with the author go to a notebook in one click, from the post itself.
Researching a video means watching twenty others first.
Send a channel’s uploads, a playlist or a YouTube search to a notebook, then ask it what they cover and what they skip.
The best lines are scattered across articles, newsletters and PDFs.
Highlight the line and right-click. It becomes a source with the page link and the date, ready to quote and credit.
Your hook and outline prompts live in a notes app.
Keep them in your Prompts library and type a ;shortcut in ChatGPT, Claude or Gemini to drop one in. ⌘⇧P opens your prompts on any page.
The draft lives in Notion or Obsidian. The research doesn’t.
Download a notebook’s sources and notes as Markdown, or one ZIP, and put them next to the draft.
Four routines that fit around the work you already do.
Saved posts and lines you can ask questions of.
A briefing on what’s been said, before you write a word.
Your best prompts, one shortcut away wherever you write.
;shortcut. 
Sources and notes as Markdown, next to the draft.
Quoted word for word and linked to where they were posted. Reviewers don’t say what they do for a living, so we picked reviews about the features on this page.
“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.”
Something we missed? Ask us.
AI chats on ChatGPT, Claude, Gemini, Perplexity, Grok, Kimi, Genspark and OpenEvidence; posts on X, Reddit and LinkedIn; YouTube; and Google Docs. On any other page, highlight the text and right-click to send it.
Yes: a channel’s uploads, a playlist or the results of a search. Each video becomes its own source. Gemini Notebook caps the sources in one notebook, so for big channels pick the videos you need.
Yes. Type a ;shortcut in the chat box on ChatGPT, Claude, Gemini and the other supported AI sites, or open your prompts on any page with ⌘⇧P (Ctrl+Shift+P on Windows).
Not with the send button, which covers X, Reddit and LinkedIn. On other sites, highlight the text you want and right-click to send it.
Add Kortex to Chrome and send the next post that makes you think. Make content about Gemini Notebook? Apply for the creator pass.
100,000+ users, rated 4.5 on the Chrome Web Store.