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Secure PDF Viewer vs MJ PDF: catalog facts
Secure PDF Viewer	MJ PDF
Free Free and open source under the MIT and Apache-2.0 licenses.	Free Free and open source under the GPL 3.0 licence.
Android	Android
Requires no app permissions Uses a sandboxed WebView to display PDF streams	Library view with recent files, folders and reading history Dark mode for the PDF content as well as the interface
Android only	Android only A reader with annotations rather than a full PDF editor
Downloadable app	Downloadable app
Open source	Open source
License: MIT AND Apache-2.0	License: GPL-3.0-only
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 2, 2026

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