GSSquared review

Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026

GSSquared is an emulator for the Apple II family, spanning Apple II, Apple II+, Apple IIe variants, and Apple IIgs systems. It is aimed at people who want to run classic Apple II software on current computers, with desktop versions for macOS, Windows, and Linux plus a browser version for quick use. That breadth makes it a fit for users moving among several Apple II models or wanting to try the emulator in a browser before choosing a desktop build.

Disk and machine configuration are central to its appeal. GSSquared loads disk images in formats including .dsk, .po, .woz, .2mg, .hdv, .img, .hda, and .iso, and it supports SmartPort storage and multi-volume hard-drive collections. Custom machine profiles and .gs2pack bundles can package a machine configuration with disks. Display options include composite, IIgs RGB, monochrome, and optional CRT effects; sound support includes Mockingboard music and IIgs Ensoniq. Input options cover USB and Bluetooth gamepads, joystick or paddle input, and mouse-as-joystick, giving users several ways to match controls to the software they run.

The software is free to download and use; according to the vendor's pricing page, the $40 Shareware contribution is suggested rather than required. The contribution covers individual use on any number of computers and is available for macOS, Windows, and Linux. A notable distinction is that the integrated debugger—covering CPU execution, memory, video, and device inspection—is limited to desktop builds, so browser-only users should not choose GSSquared specifically for debugging. Choose it for broad Apple II and IIgs coverage, varied disk support, and configurable input; consider another option if browser-based debugging is essential.

GSSquared pros and cons

• Where it wins
  • Emulates Apple II, Apple II+, Apple IIe variants, and Apple IIgs systems
  • Loads a wide range of disk images and supports SmartPort storage
  • Desktop builds include an integrated debugger for CPU, memory, video, and devices
• Where it doesn't
  • The integrated debugger is available only on desktop builds
  • Gamepad support may not suit users who need other input options
  • The $40 shareware contribution is suggested, so it does not buy a separate paid tier

GSSquared fact sheet, pricing and score →

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Last updated 14 Nov 2026 · How we research and update