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.