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Perplexity
FeaturedResearch chat that answers with the sources attached. Use it when a paragraph without links is not enough.
ResearchFree tier, then paid plans for more capable search.Added Sep 18, 2026
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Rank 04
Google's research notebook, the product that was NotebookLM. Summaries grounded in sources you upload.
Visit notebook.google.com01
Research chat that answers with the sources attached. Use it when a paragraph without links is not enough.
ResearchFree tier, then paid plans for more capable search.Added Sep 18, 2026
02
Evidence synthesis for papers, programs, and decisions. Built for research rather than general chat.
ResearchFree tier, then paid plans for deeper analysis.Added Aug 9, 2026
03
Search peer-reviewed papers and ask questions against that literature.
ResearchFree tier, then paid plans for more searches.Added Jul 28, 2026
05
Read a research paper with an explanation beside the PDF, and ask questions of the text.
ResearchFree tier, then paid plans for more papers.Added Feb 20, 2026