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Storii vs Prologue: catalog facts
Storii	Prologue
Free Free and open source under the GPL-3.0.	Freemium Available on the App Store; check the store listing for current pricing.
Android	iOS
Progress sync with Audiobookshelf Download manager with pause and resume	Works with both Plex and Audiobookshelf Offline downloads for listening without a connection
Requires an Audiobookshelf server Small, young project	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.