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PCjs vs JSLinux: catalog facts
PCjs	JSLinux
Free Free to use in the browser, with source published on GitHub.	Free Free to use in the browser.
Web	Web
Runs vintage DOS, Windows and OS/2 machines with no installation Works on desktop and mobile browsers, including iPhone and iPad	Runs entirely in the browser with nothing to install Covers x86, x86_64 and RISC-V systems
Limited to a curated set of machines and configurations Emulates slow period hardware, not suited to modern workloads	Slower than a native virtual machine Some systems have long boot times
Web application	Web application
Open source	Closed source
License not stated	License not stated
No account needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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