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KOReader vs Book's Story: catalog facts
KOReader	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.
Linux, Android	Android
Runs on Kindle, Kobo, PocketBook, Cervantes and reMarkable hardware Opens PDF, DjVu, CBZ, EPUB, FB2, Mobi, DOC, RTF, HTML, CHM and TXT	Supports EPUB, PDF, FB2, TXT, HTML and Markdown Extensive reading customisation
Installing on a locked e-reader means jailbreaking it first, at your own risk The settings menus are deep and not self-explanatory	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
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.