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WebMSX vs openMSX: catalog facts
WebMSX	openMSX
Free Free to use in the browser.	Free Free and open source.
Web	Windows, macOS, Linux
Runs in a browser with nothing to install Loads ROMs, disks, tapes and save states	Accuracy-focused MSX emulation Built-in GUI with a capable debugger
Browser performance and input depend on the device Covers MSX machines only	Android build is old and no longer current Needs MSX system ROMs for many machines
Web application	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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