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PCjs vs MartyPC: catalog facts
PCjs	MartyPC
Free Free to use in the browser, with source published on GitHub.	Free Free and open source.
Web	Windows, macOS, Linux
Runs vintage DOS, Windows and OS/2 machines with no installation Works on desktop and mobile browsers, including iPhone and iPad	Cycle-accurate IBM PC and XT emulation Runs timing-sensitive demos and software
Limited to a curated set of machines and configurations Emulates slow period hardware, not suited to modern workloads	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 October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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