Different jobs
NotebookLM is Google’s source-grounded notebook (also labeled Gemini Notebook in some Google UIs). You upload or import sources; answers are meant to stay tied to that set, with citations back into your materials.
ChatGPT is a general assistant. It can explain topics your slides never covered, and invent confident nonsense with equal fluency.
When to pick which
Have a PDF pack and a deadline? Start NotebookLM. One notebook per project keeps answers cleaner.
Need a concept explained that is not in your notes? Use ChatGPT (or Claude / Gemini), then check it against a real source.
If policy forbids uploading assignments to third parties, skip cloud notebooks or use approved tools / local runners instead.
Common mistakes
Dumping an entire course or project into one notebook. Answers get muddy.
Trusting a summary without opening the cited passage.
Using ChatGPT as your only source for a literature review. Prefer Perplexity or library databases when you need citations.
FAQ
Is NotebookLM free?
Google offers free access with limits. Check NotebookLM for current caps and account requirements.
Can it hallucinate?
Yes. It can misread chunks or miss pages. Open the cited passage when the answer matters.