Hey Product Hunt 👋 I'm Theo chen, technical co-founder of GrainBook After 8 months of development and 3 months of public beta, our first product is finally live. GrainBook — an AI-powered content aggregator for the way knowledge workers actually consume information. 🎯 The problem we wanted to solve Most of us subscribe to far more content than we can ever consume. YouTube channels, podcasts, Substack newsletters, Reddit threads, RSS feeds, university courses. The unread backlog turns into anxiety, not a resource. 🛠️ What GrainBook does It pulls all your subscriptions — YouTube, podcasts, Reddit, RSS, Twitter/X, Bilibili, Echo360 lectures — into one AI-summarized feed. Skim a 30-second take on a 60-minute episode, then dive in only when something deserves your attention. A few things we spent the most time on: • Multi-source aggregation in one place — stop juggling apps • A source-aware reader for each format (transcripts, chapters, embedded threads), with a beautiful liquid-glass effect on iOS 26 • Chat with your library: ask "what did I read about RAG last week?" — semantic search across your personal content, with cited sources you can tap to open • Bring your own LLM: any OpenAI-compatible API (DeepSeek, Qwen, Claude, local), keys stay on-device • Read-state tracking and a personal consumption dashboard 🙏 To everyone who joined the beta — thank you. Your feedback shaped this version. Now available on the App Store (international). Grab it → https://lnkd.in/gHxvQE_i What's a content source we're missing? Drop it in the comments.

GrainBook

An AI feed for everything you subscribe to

An AI feed for everything you subscribe to