Essgee

At a glance

• Editor score
  6.4 / 10
• Pricing
  Open source
• Best for
  Minimal Windows Game Gear and SMS emulation
• Paid from
  Free
• Supported platforms
  Windows
• Facts checked
  21 Sep 2026

• Where it wins

  • Supports Sega Game Gear and Mark III/Master System emulation
  • Save states, shaders, fullscreen mode, and configurable controllers
  • Loads ROM files and ZIP archives with system-specific extensions

• Where it doesn't

  • Available for Windows rather than multiple platforms
  • ColecoVision, Game Boy, and Game Boy Color support is partial
  • Focused on emulation rather than broader library management features

Our verdict on Essgee

Essgee is an open-source desktop emulator for Sega 8-bit systems and handhelds. Its primary fit is Windows users who want Game Gear and Sega Mark III/Master System emulation in a focused application. It also covers the Sega SG-1000 and SC-3000, with partial support for ColecoVision, Game Boy, and Game Boy Color systems. The project is written in C# for .NET Framework and distributed under the MIT License, giving it a clear open-source identity for users who value source availability and a narrow emulation focus.

Its feature set covers the core requirements for this category without moving into a broader front-end or library-management role. Essgee loads ROMs through system-specific file extensions and can open ZIP archives, while save and load states provide eight slots. Fullscreen mode supports a larger display, and shader support is available through integrated and directory-based options. Controller configuration, region settings, and TV standards add useful system-level controls. Game Boy Printer and partial Game Boy Color infrared support extend the scope beyond Sega hardware, although those additions are not the central focus.

Essgee is a sensible choice for Windows users seeking straightforward Game Gear and Master System emulation with states, shaders, and controller configuration. Its platform coverage is the main boundary: users seeking an emulator for another operating system should choose a different product. The partial implementation of some additional systems also makes Essgee less suitable when ColecoVision, Game Boy, or Game Boy Color compatibility is the primary requirement. For a compact, source-available Windows emulator centered on Sega 8-bit hardware, its feature mix is well aligned with that use case.

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Essgee pricing

Essgee fact sheet

Alternatives to Essgee

• RRetroArchA free, open-source emulator frontend with broad platform coverage and deep configuration options.9.4
• GGearsystemA broad Sega emulator with unusually deep debugging and Game Gear tools.9.1
• ProvenanceA feature-rich Apple emulator with free access, optional sync upgrades, and BIOS requirements.8.9

See all Essgee alternatives →

Featured on iTechGuides

Essgee is listed in our Game Gear Emulators directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update