NotebookLM
ResearchA Google tool for working with your own corpus of documents. You upload PDFs, text, video — and get a chat, summaries, audio overviews of your material.
Best for: Research, studying long documents, exam prep, notes.
Strengths
- Cites its own sources
- Podcast-format audio overviews
- Free for most cases
Weaknesses
- Limits on source size
- Tied to a Google account
Pricing: Free; Plus as part of Google AI Pro·Difficulty: Beginner·Alternatives: claude, perplexity