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

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