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ShelfDroid vs Prologue: catalog facts
ShelfDroid	Prologue
Free Free and open source under the AGPL-3.0 licence.	Freemium Available on the App Store; check the store listing for current pricing.
Android	iOS
Offline listening from downloaded items Includes server and library management tasks	Works with both Plex and Audiobookshelf Offline downloads for listening without a connection
Requires your own Audiobookshelf server Android only	Apple devices only Requires your own Plex or Audiobookshelf server
Downloadable app	Downloadable app
Open source	Closed source
License: AGPL-3.0-or-later	License not stated
Account 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.