NotebookLM

NotebookLM lets you upload documents and have AI conversations grounded in your sources—it even generates podcast-style audio summaries. **Free to use** with generous limits; Google AI Plus adds more notebooks and Audio Overviews, Google AI Pro raises source limits, and Google AI Ultra has the highest. Google's plans page now lists it as

Available on: Windows macOS iOS Android web API

Verified: 2026-09-11

Sources: https://notebooklm.google.com/, https://blog.google/technology/ai/notebooklm-google-ai/