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Prologue vs BookPlayer: catalog facts
Prologue	BookPlayer
Freemium Available on the App Store; check the store listing for current pricing.	Free Free to download; source code is public.
iOS	iOS
Works with both Plex and Audiobookshelf Offline downloads for listening without a connection	Dedicated to DRM-free audiobook files Open source
Apple devices only Requires your own Plex or Audiobookshelf server	iOS only Does not play DRM-protected store audiobooks
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.