Unriddle
AI research assistant for reading papers and documents - chat with PDFs, get instant explanations, and surface connections across your library.
Unriddle is an AI-powered research assistant built for academic papers, reports, and document-heavy workflows. Users upload PDFs and can immediately ask questions in natural language, with answers grounded in the document and linked back to source passages. Unriddle surfaces key claims, generates summaries, and maintains a concept graph showing connections between documents in the user library. Notes taken in Unriddle link automatically to relevant source documents. A browser extension enables importing papers directly from the web. The tool is popular among PhD students, researchers, and professionals who need to synthesize large volumes of written material quickly.
Key Features
- Chat with any uploaded PDF using natural language questions with inline source citations
- Auto-generated summaries highlighting key claims and findings from documents
- Concept graph - visualize connections between papers and documents in your library
- Smart notes that automatically link to relevant source passages when you write
- Browser extension for importing papers directly from publisher pages
- Cross-library search across all uploaded materials simultaneously
Use Cases
- PhD students synthesizing literature reviews across dozens of papers quickly
- Professionals staying current with industry reports without reading every page
- Students understanding complex academic papers in unfamiliar research areas
- Analysts building cross-referenced document repositories for research projects
Pros
- Free plan allows up to 10 documents with daily AI calls - sufficient for light research
- Inline citations ground AI answers in source text, reducing hallucination risk significantly
- Concept graph reveals relationships between uploaded papers you may not have spotted
Cons
- 10-document free plan limit becomes restrictive for active literature review work
- Citation accuracy drops with poorly formatted or scanned PDF documents
- Limited support for documents in languages other than English
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