Kortex collects Reddit threads, X posts, competitor pages, your brand docs and AI chats into a Gemini Notebook per campaign, so briefs and copy start from what customers say.
100,000+ users, rated 4.5 in 410 Chrome Web Store ratings.
Marketers use Kortex, a Chrome extension for Gemini Notebook (formerly NotebookLM), to collect customer language from Reddit, X and LinkedIn, competitor pages and their own brand docs in a notebook per campaign or audience. They ask it for angles and objections with citations, keep brand prompts one shortcut away in any AI chat, and export briefs as Markdown or PDF.
The best copy uses the customer’s own words. Kortex helps you keep them.
The perfect customer quote was in a Reddit thread you scrolled past.
Send Reddit posts with their top comments, X threads and LinkedIn posts with the author to the audience’s notebook in one click.
Competitor positioning is a dozen sites you check by hand.
Crawl each competitor’s site into a notebook and ask how they position against you.
AI copy drifts away from your brand voice.
Keep your brand guide in the notebook and your brand-voice prompts in the Prompts library, one ;shortcut away in ChatGPT, Claude or Gemini.
Briefs don’t say where the insight came from.
Gemini Notebook answers from your sources and cites each point, so the brief can point at the thread or page behind it.
Every campaign starts a new folder of tabs.
Duplicate last campaign’s notebook in one click, or save it as a template with its tags and collection.
From what customers say to what goes in the brief.
Objections and phrases from real threads, each with its source.
How each competitor positions and prices, from their own pages.
Your voice prompts, one shortcut away in any AI chat.
;shortcut. A brief whose insights point at their sources.
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.
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.
Gemini Notebook drafts from your sources, and your saved prompts work in ChatGPT, Claude and Gemini too. Kortex keeps the research and the prompts in order; the copy still needs your edit.
Crawl their sites into a notebook and run the crawl again when you want a fresh copy. Kortex MCP can also ask a notebook a question on a schedule.
There’s no direct integration. Export the reports as documents and add them in Gemini Notebook.
Add Kortex to Chrome and send the next Reddit thread where a customer explains their problem.
100,000+ users, rated 4.5 on the Chrome Web Store.