GrainBook
An AI feed for everything you subscribe to
GrainBook launched on June 13, 2026.
What it does
Subscribe to YouTube, podcasts, Reddit, RSS, Twitter, Bilibili, and Echo360 lectures — all in one AI-summarized feed. Skim a 30-second take on a 60-minute episode, then chat with your entire library: "what did I read about RAG?" Cited sources, your own LLM.
GrainBook is a professional AI learning tool that helps you get smart summaries from various sources such as YouTube, podcasts, emails, and build your personal knowledge base to improve your learning efficiency.
Every video, podcast and newsletter you follow — distilled by AI into a three-minute read. YouTube, podcasts, bilibili, X, Reddit, RSS, newsletters, ebooks — everything you follow, in a single feed. Quick take, deep summary, full transcript — go exactly as deep as you want and miss nothing. Favorites, history and tags turn scattered fragments into your personal knowledgefrom grainbook.app
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