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ProseReader vs Episteme Reader: catalog facts
ProseReader	Episteme Reader
Free Free and open source under the GPL-3.0.	Free Free and open source under the AGPL-3.0.
Android	Android, iOS
Actively developed with frequent releases Available on F-Droid	Reads PDF, EPUB, MOBI and AZW3 in one app Also opens Markdown, HTML and plain text
Focused on EPUB files Small user base and community	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	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.