This is really impressive! One thing I’ve often wanted is a way to listen to an ebook (say, while cooking), and then later be able to sit down and read from where I left off. This essentially requires the same functionality that Storyteller offers (syncing progress through an ebook and audiobook), though arguably overkill for this use case (since I could handle a more coarse alignment). In any case, is this something Storyteller would be good for? Or are there other tools for the job?

That is actually the exact use case that I originally built Storyteller for! I wanted to listen to my books on long runs, and then switch to reading when I got back.

The Storyteller mobile apps have great support for this, I think. They have fully fledged audiobook players and ebook readers, and you can switch between the two with one tap. And then of course you can also double tap on a sentence and start playing from there, with the app highlighting the currently read sentence.

Storyteller works great for this. It even syncs your position across devices. So when I really want to settle in to read, I go ahead and switch from my iPhone where I was listening to my Boox e-ink reader which syncs right to where I left off.