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