GrainBook: AI Content Reader

Turn every video, podcast, newsletter, and article you follow into a searchable AI knowledge feed.

GrainBook brings your subscriptions together, summarizes new content, and lets you ask questions grounded in the sources you trust. Spend less time scrolling and keep more of what matters.

Join 3,000+ active readers who use GrainBook to learn from the internet without drowning in it.

ONE FEED FOR EVERYTHING YOU FOLLOW

• Follow or save content from YouTube, podcasts, Bilibili, X/Twitter, Reddit, RSS, newsletters, ebooks, and web pages
• See new releases in one calm, personalized feed
• Discover creators worth following across topics you care about

AI SUMMARIES THAT SAVE TIME

• Turn long videos, podcast episodes, and articles into clear summaries
• Choose the depth you need—from a quick take to a deeper read or transcript
• Start your day with a digest of unread updates from yesterday

ASK YOUR KNOWLEDGE

• Ask questions across your subscriptions, notes, collections, and saved content
• Use @ to focus GrainBook AI on a creator, source, collection, note, or individual item
• Get answers grounded in your content, with citations that open the original source
• Ask AI while reading, then continue the conversation in Chat

SAVE WHAT MATTERS

• Save important insights and organize them with collections and tags
• Search your library and revisit your reading history
• Keep every original source one tap away

HOW IT WORKS

1. Subscribe to a source or save a link
2. GrainBook fetches, transcribes, and summarizes new content
3. Read the essentials, ask follow-up questions, and save what matters

Start free and turn information overload into a knowledge habit.

GrainBook offers optional auto-renewing subscriptions. Payment is charged to your Apple Account at confirmation. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel anytime in your App Store account settings.

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