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ShelfPlayer vs BookPlayer: catalog facts
ShelfPlayer	BookPlayer
Free Free; source code is published on GitHub.	Free Free to download; source code is public.
iOS	iOS
Native iOS interface Works with self-hosted Audiobookshelf libraries	Dedicated to DRM-free audiobook files Open source
Requires an Audiobookshelf server iOS only	iOS only Does not play DRM-protected store audiobooks
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
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.