Source-grounded AI vs real-time web research.
by Google
NotebookLM lets you upload documents, PDFs, videos, and websites, then ask questions answered exclusively from YOUR sources — no hallucinations from general training data, only citations from what you uploaded. The Audio Overview feature converts any document into a podcast-style dialogue.
by Perplexity AI
AI-powered search engine. Every answer comes with sources. Pro ($20/mo) unlocks GPT-5, Claude Opus, and Perplexity Spaces.
| Feature | NotebookLM | Perplexity |
|---|---|---|
| Vendor | Perplexity AI | |
| Category | AI Search | AI Search |
| Free tier | Yes | Yes |
| Starting price | Free / $20/mo | Free / $20/mo |
| Strengths | answers grounded only in your sources, PDF/YouTube/Google Doc ingestion, Audio Overview podcast generation | citations on every claim, good for research, follow-up threading |
| Weaknesses | limited to uploaded sources (no real-time web search), 50 notebook limit on free plan | weaker pure chat, some sources low-quality |
New head-to-heads, price drops, launches. One email per week.
No spam. We never share your address.