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Kyu

Problem. reading books in isolation makes it hard to retain ideas or connect them across your library.

Solution. chat with your books — an AI agent that searches the text, cross-references your library, and pulls from the web with inline citations.

Tech stack

• Next.js 16, React 19, TypeScript
• Supabase (Postgres + pgvector + Auth + Storage)
• Drizzle ORM
• Vercel AI SDK with multi-provider support (Anthropic, OpenAI, xAI)
• OpenAI text-embedding-3-small for semantic search
• Tavily for web search, Langfuse for tracing

Features

• In-browser EPUB reader
• Conversational AI agent with inline citations
• Semantic search across your entire library
• Web search fallback when the answer isn't in the book
• Knowledge-graph view connecting ideas across books