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Gearsystem vs Genesis Plus GX: catalog facts
Gearsystem	Genesis Plus GX
Free Free, with source code published on GitHub.	Free The open-source emulator is available without a license fee.
Windows, macOS, Linux	Windows, macOS, Linux
Focus on accurate emulation Built-in debugger for developers	One core covers Mega Drive, Sega CD, Master System, Game Gear and SG-1000 Accurate sound emulation, including the Sega CD's PCM
Covers only Sega 8-bit systems	Usually run through RetroArch rather than as a standalone application
Downloadable app	Downloadable app
Open 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 September 23, 2026	Official website Full listing and sources Checked September 22, 2026

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