Thanks for the BookOrbit hint. Seems very interesting.

I see it supports audiobooks and ebooks. Do you know if there is any way for keeping sync between an audiobook and ebook?

It does not have any sort of "whispersync" but, ironically?, I feel like whispersync could be recreated with things like Whisper and parsing the epub/whatever to line up progress. BookOrbit is in active development from what I can see (I'm not connected to the project, just a happy user) and it wouldn't surprise me if that was a feature in the future. It's something I've mulled over building for a while (even before Whisper).

For my Audiobooks I don't use BookOrbit because my setup is:

- Buy on Audible

- Rip DRM off

- Add to Plex

- Use Prologue (iOS only) to listen

And I freaking love that setup so I'm not looking to replace it currently.