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v86 vs QEMU: catalog facts
v86	QEMU
Free Free and open source.	Free Free and open source, with no paid edition.
Web	Windows, macOS, Linux, Command line
Runs whole operating systems in a browser tab x86-to-WebAssembly JIT for better speed	Emulates whole machines across processor architectures, not just same-architecture VMs Near native performance when paired with KVM or Xen
Slower than native virtualization Best suited to older or lightweight operating systems	Raw QEMU is a command line tool with a large and unfriendly option surface Cross-architecture emulation is far slower than virtualisation on matching hardware
Web application	Downloadable app
Open source	Open source
License not stated	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 23, 2026	Official website Full listing and sources Checked September 20, 2026

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