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v86 vs MartyPC: catalog facts
v86	MartyPC
Free Free and open source.	Free Free and open source.
Web	Windows, macOS, Linux
Runs whole operating systems in a browser tab x86-to-WebAssembly JIT for better speed	Cycle-accurate IBM PC and XT emulation Runs timing-sensitive demos and software
Slower than native virtualization Best suited to older or lightweight operating systems	Focused on early PCs, not later 386 or Pentium machines Accuracy comes at a higher CPU cost than simpler emulators
Web application	Downloadable app
Open source	Open source
License not stated	License: MIT
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 October 2, 2026

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