Guide · Talk to the books you read

How to Ask Questions About an Ebook (EPUB or PDF)

You finished the book, and a month later you cannot remember the argument in chapter four. Here is how to make an ebook something you can question.

By Ilian Raykov, founder of BrainTube

The short answer

  • Share an EPUB or PDF to BrainTube.
  • It is read, summarised and indexed.
  • Ask Cue questions and get answers that point back to the book.

Step by step

1. Add the book

Share a DRM-free EPUB or PDF from Files to BrainTube, or upload it on brain-tube.com.

2. Let it read

BrainTube reads the book, writes a summary and indexes it so every section is searchable.

3. Ask questions

Ask Cue things like "what does the author say about habits?" and get an answer with links to the source.

4. Keep the key ideas

Review the ideas you want to keep with FSRS spaced repetition, and connect them to related videos and articles.

Get started

Frequently asked

Can AI answer questions about a book?
Yes, if the book is in a library it can search. Save the EPUB or PDF to BrainTube and Cue answers from its text.
Does it work with Kindle books?
BrainTube reads EPUB and PDF files. Books locked by DRM cannot be uploaded.
Does it sync to my computer?
Your BrainTube account syncs with the web app at brain-tube.com, so what you save on iPhone is on your desktop too.
Is it free?
BrainTube is free with 30 credits a month plus credits you earn. Starter and Pro add more credits.

Save once. Query anywhere.

Your YouTube library, in the AI tools you already use.

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