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nsxiv vs Swayimg: catalog facts
nsxiv	Swayimg
Free Free open-source software.	Free Free and open source.
Linux	Linux
Very small and fast Keyboard-driven with a thumbnail browsing mode	Wide format support including JPEG XL, HEIC, AVIF and RAW Lua scripting for customization
X11 only Configured by editing source and recompiling	Linux only and aimed at Wayland Configuration takes more effort than a typical desktop viewer
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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