If you've used Google's NotebookLM for any serious research, you already know its split personality: the AI is genuinely good, and everything around it is frustrating. Sources are tedious to add in bulk, there's no real folder structure, you can't save a prompt you reuse twenty times a week, and getting your work back out feels deliberately discouraged. Kortex is a Chrome extension built squarely at that frustration.
It doesn't replace NotebookLM — it grafts onto it. Install it and a set of tools appears inside NotebookLM's own sidebar: bulk-import web pages, PDFs, YouTube videos and social posts as sources; export chats and notes; nest notebooks in folders; and keep a library of reusable prompts. The screenshot above is the actual product — note that it's NotebookLM's interface, with Kortex's source-capture and export controls slotted in.
The reception backs up the pitch. On the Chrome Web Store it's at 100,000 users and 4.8 stars across 328 ratings, and it was last updated two days before this review — this is an actively, almost frantically, maintained product, not a launch-and-abandon extension.
Who it's for
NotebookLM power users and researchers — anyone whose day involves pulling lots of sources into NotebookLM, organizing them, and getting summaries back out. For that person, Kortex closes most of NotebookLM's day-to-day annoyances, and the price (a few dollars a month, or $99 once) is easy math.
Who should skip it
If you open NotebookLM occasionally, the free tier or plain NotebookLM is enough — don't pay for power you won't use. And if you don't use NotebookLM at all, there's nothing here for you; start with NotebookLM itself, or a broader tool like Obsidian or Notion.
One honest caveat: this is a first look, not a long-term hands-on test, so I'm not scoring it. Two things to weigh yourself — it's a third-party extension with access to your NotebookLM data (a permissions decision only you can make), and its pricing visibly shifts, so confirm the current plan before buying.