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GrainBook
An AI feed for everything you subscribe to
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.
Top comment
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.
About GrainBook on Product Hunt
“An AI feed for everything you subscribe to”
GrainBook was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #158 on the daily leaderboard. 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.
On the analytics side, GrainBook competes within iOS, Productivity and News — topics that collectively have 803k followers on Product Hunt. The dashboard above tracks how GrainBook performed against the three products that launched closest to it on the same day.
Who hunted GrainBook?
GrainBook was hunted by TheoChen. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of GrainBook including community comment highlights and product details, visit the product overview.