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