No endless tables — just the differences that matter, and a clear call. Pick two tools and see who takes it.
| Tool | ||
|---|---|---|
| Pricing | Freemium | Freemium |
| Rating | ||
| Category | AI Research | AI Search Engines |
| Description | NotebookLM is Google's AI research assistant that works exclusively with documents you upload, rather than the open web. It generates summaries, answers questions grounded in your sources, and creates Audio Overviews — podcast-style conversations between two AI hosts discussing your material. Designed for students, researchers, and professionals who need to make sense of large document collections. | Perplexity AI is an answer engine that combines real-time web search with large language models to produce cited, sourced responses. It targets researchers, students, and professionals who need accurate answers with traceable evidence rather than raw search results. Unlike traditional search, it synthesizes multiple sources into a coherent answer with inline citations. |
| Source-grounded Q&A — answers cite specific passages from your documents | Supported | Not supported |
| Audio Overviews: AI-generated podcast-style summaries (English) | Supported | Not supported |
| Support for PDFs, Google Docs, Google Slides, YouTube URLs, and web pages | Supported | Not supported |
| Up to 50 sources per notebook, approximately 500K words per source | Supported | Not supported |
| Study Guide generation: key concepts, glossary, practice questions | Supported | Not supported |
| Timeline and FAQ auto-generation from source material | Supported | Not supported |
| Inline citation links back to original source passages | Supported | Not supported |
| Google AI Pro tier adds expanded limits and priority access | Supported | Not supported |
| Real-time web search with inline citations | Not supported | Supported |
| Pro Search mode for multi-step research queries | Not supported | Supported |
| Spaces: shareable research workspaces | Not supported | Supported |
| File upload and analysis (PDFs, images) | Not supported | Supported |
| Focus modes: Academic, YouTube, Reddit, News, Wolfram Alpha | Not supported | Supported |
| API access with sonar-pro and sonar models | Not supported | Supported |
| Collections for organizing research threads | Not supported | Supported |
| Mobile apps for iOS and Android | Not supported | Supported |
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| Website | Visit | Visit |
