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Head-to-head · Sega Master System Emulators

Gearsystem vs SMS Plus GX

  • Updated Oct 2026
  • Both researched from official sources
  • 6 checks side by side
Higher score Gearsystem #1 in Sega Master System Emulators 9.4/10 Free plan Free plan✓ 3 of 5 features Visit Gearsystem
SMS Plus GX #8 in Sega Master System Emulators 7.9/10 Free plan Free plan✓ 2 of 5 features Visit Libretro

Gearsystem leads on 0 checks, SMS Plus GX on 0, and 6 are even. Who comes out ahead on the 6 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreGearsystem · 9.4/10
  • Free planboth
  • Most featuresGearsystem · 3 of 5

Gearsystem scores higher on our rubric for sega master system emulators: 9.4 against 7.9 out of 10; our editors rank them #1 and #8.

Gearsystem is the better fit for most users wanting a full-featured SMS emulator. SMS Plus GX is the better fit for android and Linux users wanting practical SMS tools.

  • Gearsystem fits best

    Most users wanting a full-featured SMS emulator

  • SMS Plus GX fits best

    Android and Linux users wanting practical SMS tools

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Side by side

Feature Gearsystem 9.4/10 Visit ↗ SMS Plus GX 7.9/10 Visit ↗
At a glance
Editor score 9.4 7.9
Ranking #1 in Sega Master System Emulators #8 in Sega Master System Emulators
Best for Most users wanting a full-featured SMS emulator Android and Linux users wanting practical SMS tools
Pricing model Free Free
Starting price Free plan Free plan
Free plan ✓ ✓
Free trial — —
Deployment Desktop, Mobile Mobile, Desktop
Platforms Web, Windows, macOS, Linux, iOS, Android Android, Linux
Support Community Docs
Built for Solo, Small business Solo, Small business
Features Gearsystem 3/5 · SMS Plus GX 2/5
Source available ✓ ✓
Built-in debugger ✓ (best) Not checked yet
Netplay support Not checked yet —
Cheat support ✓ ✓
BIOS required — —
Specs
Supported platforms Windows, macOS, Linux, BSD, RetroArch, Android, iOS, tvOS, webOS, Emscripten and other Libretro targets Android, Linux
Our review
Pros
  • Supports Master System, Mark III, Game Gear and SG-1000 software
  • Includes save states, rewind, cheats and a full debugger
  • Runs across desktop, mobile, web and Libretro-supported platforms
  • Supports Sega Master System and Game Gear software
  • Includes save states, rewind, cheats, and controller remapping
  • Offers configurable hardware, region, and video filtering options
Cons
  • The full debugger may be more than casual players need
  • Gear-to-Gear communication is documented for local desktop processes
  • Network netplay is not part of the documented feature set
  • Requires a compatible libretro frontend such as RetroArch
  • Netplay is not supported
  • ColecoVision support is experimental and requires a separate BIOS
Our verdict

Gearsystem is an open-source C++ emulator for Sega Master System, Sega Mark III, Game Gear, SG-1000 and Othello Multivision software. It is aimed at players who want more than basic ROM playback, as well as developers and enthusiasts who…

Read the review →

SMS Plus GX is an open-source libretro emulator core for Sega Master System and Game Gear software, with experimental ColecoVision support. It suits Android and Linux users who want a free way to run supported retro cartridge image formats…

Read the review →
  1. GearsystemSega Master System Emulators 9.4Free plan
  2. SMS Plus GXSega Master System Emulators 7.9Free plan

Strengths and trade-offs

  • Gearsystem — where it wins

    • Supports Master System, Mark III, Game Gear and SG-1000 software
    • Includes save states, rewind, cheats and a full debugger
    • Runs across desktop, mobile, web and Libretro-supported platforms

    Where it doesn't

    • The full debugger may be more than casual players need
    • Gear-to-Gear communication is documented for local desktop processes
    • Network netplay is not part of the documented feature set

  • SMS Plus GX — where it wins

    • Supports Sega Master System and Game Gear software
    • Includes save states, rewind, cheats, and controller remapping
    • Offers configurable hardware, region, and video filtering options

    Where it doesn't

    • Requires a compatible libretro frontend such as RetroArch
    • Netplay is not supported
    • ColecoVision support is experimental and requires a separate BIOS

More comparisons

All sega master system emulators comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update