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Xreader vs MuPDF: catalog facts
Xreader	MuPDF
Free Free and open source under the GPL 2.0.	Free Free and open source under the AGPL. Commercial licensing is sold separately.
Linux	Windows, macOS, Linux, Android, iOS, Command line
Opens many formats including DjVu, XPS and comic archives Actively maintained by the Linux Mint team	Extremely fast and small, with accurate rendering The bundled mutool covers most scripted PDF manipulation
Linux only Some formats depend on optional backend libraries being installed	The viewer interface is deliberately minimal and keyboard-driven Commercial use of the library needs a paid licence from Artifex
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: AGPL-3.0
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 22, 2026

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