Book Connection Discovery Engine

A tool that uses AI to find surprising connections and patterns across multiple non-fiction books in your library. Users upload or link their book collection and get AI-generated insights about how ideas connect across different domains. Target: readers, researchers, and lifelong learners who want deeper understanding beyond summaries.

The personal knowledge management wave — driven by tools like Obsidian, Roam, and Readwise — has primed a segment of serious readers to pay for software that makes their reading more durable and connective, which is real tailwind here. Readwise Reader is the closest substitute, though it focuses on highlights and retention rather than cross-book synthesis, leaving genuine whitespace. The $500–2.5k/mo revenue band is honest given the niche audience: lifelong learners and researchers are real, but the subset willing to pay for AI-generated connection graphs rather than doing it themselves in Obsidian is probably small. The biggest risk is that outputs feel impressive once and then repetitive — if the AI connections don't surface genuinely surprising or actionable insights consistently, churn will be fast and word-of-mouth flat.