GrainBook

GrainBook turns the sources you already follow — YouTube, podcasts, RSS feeds, newsletters, Reddit, and more — into a single, searchable knowledge feed. Every video, episode, and article gets a clear AI summary, so you can stay informed without spending hours scrolling. MULTI-SOURCE INTEGRATION Bring all your subscriptions into one place. GrainBook fetches new content from YouTube channels, podcasts, RSS feeds, email newsletters, Twitter/X, Reddit threads, and saved web pages — and keeps everything in sync automatically. SMART AI SUMMARIES Concise, faithful summaries for everything you save. Read the gist in 30 seconds; open the full source when something catches your attention. Designed for the way you actually want to consume long-form content. ASK YOUR LIBRARY Talk to your saved content. Ask GrainBook anything — "show me podcasts about RAG", "what did I read about React Native last week" — and get answers grounded in your own sources, with citations you can tap to open the original. SAVE AND REVIEW Build a personal knowledge library. Star important insights, group them into collections, and come back to reflect, review, and connect ideas over time.