Unriddle helps researchers and students process dense academic material faster: upload papers, and it answers questions grounded in that specific literature, summarizes findings, and helps connect ideas across multiple sources.

Upload PDFs of research papers, textbooks, or reports, and Unriddle indexes them so you can ask direct questions, "what methodology did this study use," "how does this finding compare to the other paper I uploaded", with answers cited back to the source material. Its cross-document reasoning is the useful part: rather than summarizing one paper at a time, it can synthesize connections and contradictions across your entire uploaded library, the actual work of literature review that eats graduate student time.

Who is it for?

Graduate students and researchers conducting literature reviews, and anyone working through a stack of academic papers who wants faster synthesis than manual reading allows.

How much does Unriddle cost?

A free tier covers limited document uploads and queries. Paid plans start around $12 per month for expanded library size and query volume, aimed at regular academic use.

Our verdict

Unriddle's cross-document synthesis is genuinely useful for literature review specifically, more valuable than single-paper summarizers. For grad students drowning in PDFs, it meaningfully compresses research time.