Perplexity
Education & ResearchAI answer engine that searches the web and cites its sources.
NotebookLM lets you upload documents, PDFs, websites and videos, then ask questions answered only from those sources, with citations. It can also turn your material into study guides, mind maps and podcast-style audio overviews. It is free to use, with higher limits on Google AI plans.
NotebookLM has a free plan or free trial, with paid plans for more features or usage.
Google's research notebook that learns from your own documents.
Popular alternatives include Perplexity, Blinkist, Brainly.
See 14 alternatives to NotebookLM →
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AI answer engine that searches the web and cites its sources.
Book summaries in text and audio.
Homework help with AI and community answers.