Unriddle

Unriddle is an AI research and document analysis tool designed for students, researchers, and knowledge workers who need to extract meaning from large documents and build connected understanding across multiple sources. Its primary interface presents uploaded documents alongside an AI assistant trained specifically on those documents, questions receive answers grounded in the actual uploaded material rather than general AI knowledge, with citations indicating exactly where the information comes from. The AI can generate summaries at different levels of detail, identify the key claims in a paper, compare methodologies across multiple documents, and create study notes formatted for learning rather than raw extraction. Unriddle's concept linking feature identifies when concepts mentioned in different documents relate to each other, building a connections map across a research collection.

The Highlights system lets users mark important passages that are automatically organized and searchable across all documents. Study Mode reformats document content into flashcards and practice questions for active recall learning. Plans start at $16/month for individuals with support for up to 50 documents. Unriddle is strongest for graduate students, researchers, and intensive learners who process high volumes of complex documents and need AI assistance that stays grounded in their specific source material rather than drifting into general responses.