Notion
ChatPDF
Perplexity.ai
ChatGPT
Quizlet
Obsidian
Claude AI
AI-first notebook by Google, available in the U.S., blends large language models and user-chosen data. Apply for access to explore intelligent insights and enhance your note-taking experience.

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Which is more popular?
Based on our record, NotebookLM seems to be more popular. It has been mentioned 10 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | notebook.google.com | opalstack.com |
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What each product offers, as listed by its team.

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An editorial look at what each product does well and who it suits.

Overall verdict
Why this product is good
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Google made a new AI note app - NotebookLM review
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Recommendations tracked on public social media and blogs since March 2021.

Gemini Notebook only generates content based on your sources and will not hallucinate or provide false or unrelated information. I cannot overemphasize the importance of this platform while following through with this certification... - Source: dev.to / 19 days ago
You just need a few summaries occasionally. Standing up Ollama, a model, and an extraction pipeline to summarize five PDFs is overkill. If privacy isn't the constraint, a free web tool does it in seconds — ChatPDF and NotebookLM if you... - Source: dev.to / about 2 months ago
Last year I was heavily into Perplexity but for most of 2026 I've actually been using NotebookLM a lot more. Perplexity is still useful for just daily news, but when I want to research, when I want to summarise, when I want to learn...... - Source: dev.to / 4 months ago
Tracking Opalstack since Sep 2023.
When comparing NotebookLM and Opalstack, you can also consider the following products.

All-in-one workspace. One tool for your whole team. Write, plan, and get organized.
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Chat with any PDF! Join millions of students, researchers and professionals to instantly answer questions and understand research with AI
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ChatGPT is a powerful, open-source language model.
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Quizlet allows you to review and create flashcards for a variety of subjects, such as math and reading.
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A second brain, for you, forever. Obsidian is a powerful knowledge base that works on top of a local folder of plain text Markdown files.
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