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Prologue vs Storii: catalog facts
Prologue	Storii
Freemium Available on the App Store; check the store listing for current pricing.	Free Free and open source under the GPL-3.0.
iOS	Android
Works with both Plex and Audiobookshelf Offline downloads for listening without a connection	Progress sync with Audiobookshelf Download manager with pause and resume
Apple devices only Requires your own Plex or Audiobookshelf server	Requires an Audiobookshelf server Small, young project
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0
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.