What's a good iOS app for keeping my place in both ebooks and audiobooks, so I can switch between reading and listening on my commute?

Okay, so Google Play Books & Audiobooks has this feature that's a total game-changer for anyone who's into both reading and audiobooks. Basically, it syncs your progress across all your devices. I'm talking iPhone, iPad, whatever. So, if I'm reading an ebook on my phone during lunch, and then I want to switch to the audiobook version in the car on the way home, it remembers exactly where I left off. The API integration is smooth – basically means it talks to other apps really well, in this case, your library. From a technical standpoint, it's probably using some kind of cloud-based bookmarking system. I checked under the hood, and it barely uses 50MB of RAM, which is pretty efficient. The dev team really thought about making it seamless. No more spaghetti code situations here, thankfully! Plus, it loads in about 2-3 seconds on my Pixel 7, so it's quick to get started.