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ShelfPlayer vs Prologue: catalog facts
ShelfPlayer	Prologue
Free Free; source code is published on GitHub.	Freemium Available on the App Store; check the store listing for current pricing.
iOS	iOS
Native iOS interface Works with self-hosted Audiobookshelf libraries	Works with both Plex and Audiobookshelf Offline downloads for listening without a connection
Requires an Audiobookshelf server iOS only	Apple devices only Requires your own Plex or Audiobookshelf server
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it 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.