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Looking Glass vs SPICE: catalog facts
Looking Glass	SPICE
Free Free and open source under the GPL 2.0 licence.	Free Free open source software.
Windows, Linux	Linux
Low-latency display and input for passthrough VMs No extra monitor, keyboard or mouse needed	USB redirection and folder sharing with the guest Audio and video playback from the VM
Requires a working GPU passthrough setup Needs a Linux host and a Windows guest	Needs a hypervisor with SPICE support and guest tools installed Several separate components to set up
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License not stated
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 September 24, 2026

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