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

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