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