Free
NotebookLM
Research
Google research assistant that answers questions grounded in sources users provide, and generates summaries and study materials. Availability and limits vary by account and region.
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Freemium
Tavily
Research
Search API built for AI agents and research workflows, returning web results and extracted content for grounded answers. Usage and result limits are plan-dependent.
Freemium
Genei
Research
Genei is an AI research and summarization tool for extracting key information from documents and web sources and organizing research notes. It offers a free trial and paid plans.