Spotify is testing a feature that syncs audiobooks with paper editions by Jess Weatherbed

Using Page Match will require users to unlock or purchase the audiobook on Spotify, and own either the paper or ebook version of the same book. The feature works by scanning the page you’re currently reading with your device camera, using optical character recognition (OCR) to identify passages that are then matched to specific timestamps in the audiobook.

I wrote about a similar idea in mixed format books. It would be good to see it out in the world.