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Fossify Documents vs Episteme Reader: catalog facts
Fossify Documents	Episteme Reader
Free Free and open source under the GPL 3.0, with no ads.	Free Free and open source under the AGPL-3.0.
Android	Android, iOS
Opens PDF, DOCX, Markdown, CSV and HTML in one app Edits text, Markdown and CSV files	Reads PDF, EPUB, MOBI and AZW3 in one app Also opens Markdown, HTML and plain text
Still in beta DOCX files are view-only	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
No account needed	Not stated if an account is needed
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.