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MJ PDF vs Secure PDF Viewer: catalog facts
MJ PDF	Secure PDF Viewer
Free Free and open source under the GPL 3.0 licence.	Free Free and open source under the MIT and Apache-2.0 licenses.
Android	Android
Library view with recent files, folders and reading history Dark mode for the PDF content as well as the interface	Requires no app permissions Uses a sandboxed WebView to display PDF streams
Android only A reader with annotations rather than a full PDF editor	Android only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: MIT AND Apache-2.0
No account needed	Not stated if an account is needed
Not stated if it 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 8, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.