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Episteme Reader vs ProseReader: catalog facts
Episteme Reader	ProseReader
Free Free and open source under the AGPL-3.0.	Free 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	Actively developed with frequent releases Available on F-Droid
Desktop and iOS versions are not confirmed as released Contributions require signing a CLA	Focused on EPUB files Small user base and community
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0	License: GPL-3.0
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.