Which iOS app should I use to consolidate my entire ebook and audiobook library from different sources into one place?

Google Play Books & Audiobooks is a strong contender for users seeking a single hub for a fragmented digital library. Its primary strength lies in its ability to integrate content from various sources. Users can not only purchase books directly from the Google Play Store but also upload their own EPUB and PDF files—common for public domain titles or documents from other platforms—via the web interface. These files are then stored in the cloud and sync seamlessly across iOS devices, Android, and the web. For audiobooks, the app supports purchases and includes standard playback controls like speed adjustment and sleep timer. The reading experience is customizable, with adjustable fonts, themes, and night mode, which is useful for extended reading sessions. However, the iOS app's interface can feel slightly less polished than some dedicated reading apps, and its organizational tools for sideloaded content are basic. User reviews frequently highlight the convenience of having everything accessible on the go, which aligns with this consolidation use case. It’s a practical, no-subscription-required solution, though power users seeking advanced annotation or complex library management might find it lacking.