The best Kortex alternative for NotebookLM research (Gemini Notebook)

If you've searched for a NotebookLM extension, you've run into Kortex. It's the best-known one, it does a lot, and it's also the most expensive — and when I looked closely at what it asks for in return, I decided to build the thing I actually wanted instead. This is an honest comparison, from someone who is obviously not neutral. I'll tell you where Kortex is the better pick, too.

Quick naming note first: NotebookLM became Gemini Notebook in July 2026. Same app. Every extension here, mine and Kortex included, works with both names.

The three things that made me look elsewhere

1. Price

Kortex sits at the premium end — the kind of price that makes sense if you're all-in on it as a full workspace, and doesn't if you just want NotebookLM to export citations and flashcards. I wanted the second thing, at a price that matched. NotebookBloom is $2.99/month or $29/year, with a free plan that isn't a crippled trial.

2. Permissions

This is the one that actually bothered me. A lot of powerful extensions ask for broad "read and change all your data on the websites you visit" access. That's a big blast radius for a tool that lives on top of your research. NotebookBloom uses only your own Google Drive (drive.file) for optional sync — the scope where it can only see files it created, not your whole Drive, and not every site you open. Check the permissions on anything you install here, mine included. You should know what you're granting.

3. The academic features nobody else finishes

Most NotebookLM extensions do imports and organization. Very few do the thing researchers actually need at the end: real citations. As of 2026, no other extension exports NotebookLM sources to proper APA / MLA / Chicago / BibTeX — or bridges them into Zotero. That gap is the whole reason NotebookBloom exists.

Feature-by-feature, plainly

• Citation export (APA/MLA/Chicago/BibTeX): NotebookBloom does it; most alternatives, including the obvious ones, don't. This is the moat.
• Zotero / Mendeley: NotebookBloom exports BibTeX that imports cleanly. See the Zotero guide.
• Anki flashcard export with sources: NotebookBloom does .apkg / TSV / AnkiConnect, with the source on the back of every card. Guide here.
• Cross-notebook search: NotebookBloom searches every notebook, source and prompt at once. Guide here.
• Bulk import (playlists/channels/RSS) + folders: both NotebookBloom and Kortex handle importing and organizing well — this is table stakes at the top end.
• Export to Markdown / PDF / HTML: NotebookBloom does all three, editable-first.

Where Kortex is the better choice

I'm not going to pretend otherwise. If you want a full second-brain workspace — a place to write, connect notes, and run your whole knowledge system, not just enhance NotebookLM — Kortex is built for that and NotebookBloom isn't. NotebookBloom is deliberately narrower: it makes NotebookLM a betterresearch tool, and stops there. If your center of gravity is a standalone note app, Kortex (or something like Obsidian) is the right home.

Try it without deciding anything

The free plan is real — folders, tags, prompts, cross-notebook search, exports, and a manual citation builder, no card required. Install it, keep Kortex if you have it, and see which one you actually open. That's the only comparison that counts.

NotebookBloom is an independent extension and is not affiliated with Google. NotebookLM and Gemini Notebook are names for the same Google product; NotebookLM is a trademark of Google LLC.