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MJ PDF vs Episteme Reader: catalog facts
MJ PDF	Episteme Reader
Free Free and open source under the GPL 3.0 licence.	Free Free and open source under the AGPL-3.0.
Android	Android, iOS
Library view with recent files, folders and reading history Dark mode for the PDF content as well as the interface	Reads PDF, EPUB, MOBI and AZW3 in one app Also opens Markdown, HTML and plain text
Android only A reader with annotations rather than a full PDF editor	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
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.