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Rank 02
Evidence synthesis for papers, programs, and decisions. Built for research rather than general chat.
Official site. No affiliate code.
Rank 01
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
Official site. No affiliate code.
Rank 03
Search peer-reviewed papers and ask questions against that literature.
ResearchFree tier, then paid plans for more searches.Added Jul 28, 2026
Official site. No affiliate code.
Rank 04
Google's research notebook, the product that was NotebookLM. Summaries grounded in sources you upload.
ResearchFree with a Google account. Limits depend on the account.Added Oct 8, 2026
Official site. No affiliate code.
Rank 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
Official site. No affiliate code.