The EPUBulator is for:

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Children's publishers

We turn your InDesign file or PDF, along with your MP3s of a narrator, into a fixed-layout EPUB3 with word-level media overlays – also known as a readaloud or read-along ebook.


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Ebook developers, designers, book packagers

Tired of dealing with media overlays? Using an OS that's unfriendly to readaloud production? We're your subcontractor/white label.


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Audiobook producers

Human-narrated readaloud is the anti-AI for voiced ebooks.

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The narration in a readaloud EPUB isn't AI voice, or text-to-speech. It's an MP3 of a human being reading a picture book. The words on the page light up as the narrator speaks them.

So my thought was:

Recording a book is what audiobook producers do anyway, and we're all worried about what AI is going to do to narrators. Would they want to offer readaloud ebooks to their clients? Couldn’t this open up some new possibilities in how they get paid? Wouldn't it be a fun, short version of what they do all the time anyway?

Then I thought: Do they even know readaloud ebooks exist?

Beats me. If you’re an audiobook producer and this sounds interesting, let's talk.


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Small presses, self-publishers, and nonprofits

You get a discount (we're still hammering out the details, but get in touch anyway), and bulk pricing starts at three books.


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Anyone else who wants to make a readaloud ebook

Drop us a line and we'll talk.


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A note about accessibility

Accessibility is half-fantasy when it comes to fixed-layout ebooks, plus what “accessibility” even means on any given day is a question mark – but we're all-in for the cause, and partnered with ebook accessibility expert Laura Brady's Acme Books to deliver the right stuff. If you have specific requirements, let us know.

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(With Acme, we're also about to debut something very cool in the accessible-ebook world, so stay tuned.)