Prologue by Lachlan Charlick is an iPhone app that is the original and best audiobook app for Plex. It is a full version app under the Education & Reference category and is a must-have for book lovers. With Prologue, you can stream your entire audiobook collection from anywhere in the world, and it never loses your place as it remembers playback position across all your audiobooks, synced via iCloud.

Prologue not only allows you to listen to audiobooks but also gives you the option to manage your collection. You can download books for playing any time, even when offline, organize audiobooks into collections, and access bookmarks, listening history and reading list. Moreover, the app offers advanced playback features such as variable playback speed (from 0.5x to 3x), custom sleep timers, automatically rewind after pauses and interruptions, and voice boost. The voice boost feature equalizes voices and boosts volume for loud environments.

Prologue also offers system integration features such as Siri, Shortcuts and suggestions, Widgets, and CarPlay. However, some features require a one-time purchase to unlock. With all these features, Prologue is an excellent app for audiobook lovers who want to listen to their collection anytime, anywhere, and on any device.