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virt-viewer vs Looking Glass: catalog facts
virt-viewer	Looking Glass
Free Free and open source under the GPL version 2 or later.	Free Free and open source under the GPL 2.0 licence.
Linux	Windows, Linux
Supports both SPICE and VNC displays Lightweight single-purpose viewer	Low-latency display and input for passthrough VMs No extra monitor, keyboard or mouse needed
Only a viewer, with no VM management features Mainly useful for virtual machines rather than physical desktops	Requires a working GPU passthrough setup Needs a Linux host and a Windows guest
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-or-later	License: GPL-2.0
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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