I already listened to/read a few books by jumping between the audiobook and the actual book. An app that would make both match both so you can resume in any form you want would be nice.

And while you’re at it, you could add some pictures. Maybe something like a grid of 6-8 pictures on each page. The dialogue could be in a bubble close to the speaker’s head.

If it were synced to the narrators pace I could dig it. I like reading but my ADHD is terrible and it's hard to keep my attention on books for very long. I have an easier time with audiobooks but sometimes things are hard to hear or my mind wanders for a second and rewinding doesn't always do the trick. My brain will drift right at the moment I missed several times in a row, so having something on the screen that can grab my attention would come in handy