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MartyPC vs v86: catalog facts
MartyPC	v86
Free Free and open source.	Free Free and open source.
Windows, macOS, Linux	Web
Cycle-accurate IBM PC and XT emulation Runs timing-sensitive demos and software	Runs whole operating systems in a browser tab x86-to-WebAssembly JIT for better speed
Focused on early PCs, not later 386 or Pentium machines Accuracy comes at a higher CPU cost than simpler emulators	Slower than native virtualization Best suited to older or lightweight operating systems
Downloadable app	Web application
Open source	Open source
License: MIT	License not stated
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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