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Episteme Reader vs Book's Story: catalog facts
Episteme Reader	Book's Story
Free Free and open source under the AGPL-3.0.	Free Free, ad-free and open source under the GPL 3.0.
Android, iOS	Android
Reads PDF, EPUB, MOBI and AZW3 in one app Also opens Markdown, HTML and plain text	Supports EPUB, PDF, FB2, TXT, HTML and Markdown Extensive reading customisation
Desktop and iOS versions are not confirmed as released Contributions require signing a CLA	Android only Last code update was in early 2026
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0	License: GPL-3.0-only
Not stated if an account is needed	Not stated if an account is needed
Works offline	Not stated if it 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.