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jgenesis vs Genesis Plus GX: catalog facts
jgenesis	Genesis Plus GX
Free Free to download from GitHub.	Free The open-source emulator is available without a license fee.
Windows, Linux, Web	Windows, macOS, Linux
Several Sega consoles plus the SNES in one emulator Runs in a browser through WebAssembly	One core covers Mega Drive, Sega CD, Master System, Game Gear and SG-1000 Accurate sound emulation, including the Sega CD's PCM
macOS is not officially supported Smaller project than the established multi-system emulators	Usually run through RetroArch rather than as a standalone application
Downloadable app, Web application	Downloadable app
Closed source	Open source
License not stated	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 22, 2026

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