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Librera Reader vs MJ PDF: catalog facts
Librera Reader	MJ PDF
Free Free to download.	Free Free and open source under the GPL 3.0 licence.
Android	Android
Wide format support including DjVu and comics Auto-scan of book folders with reading progress	Library view with recent files, folders and reading history Dark mode for the PDF content as well as the interface
Android only Many settings can take time to learn	Android only A reader with annotations rather than a full PDF editor
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-only
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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