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