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

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