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Gearsystem vs SMS Plus: catalog facts
Gearsystem	SMS Plus
Free Free, with source code published on GitHub.	Freemium The emulator is a free download; the Emulator Enhancer add-on is shareware.
Windows, macOS, Linux	macOS
Focus on accurate emulation Built-in debugger for developers	Accurate Master System and Game Gear emulation YM2413 FM sound and CodeMasters mapper support
Covers only Sega 8-bit systems	macOS only Gamepad and full screen support need the paid Emulator Enhancer
Downloadable app	Downloadable app
Open source	Closed source
License not stated	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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