GSplus review
A focused, free IIgs emulator with debugging, disk tools, and display effects.
Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
GSplus is a free, open-source desktop emulator for people who want to run Apple IIgs software on Windows, macOS, or Linux. Built around the KEGS emulation core and SDL3, it can boot GS/OS, run games and other Apple II software, and load disk images. Its scope is deliberately specific: this is an Apple IIgs tool rather than a general emulator for the wider Apple II family. It also requires users to supply an Apple IIgs ROM file because Apple’s copyrighted firmware is not included.
The feature set goes beyond basic booting. A built-in 65816 debugger with a terminal REPL supports software inspection, while SDL gamepads can map to the IIgs joystick with keypad fallback available. Disk workflows include drag-and-drop image mounting and host folders presented as ProDOS volumes through DynaPro. Screenshot capture, fullscreen and window/display options, plus CRT scanline and curved-screen effects, give both developers and players practical control over presentation. These capabilities make GSplus suitable for solo users and small teams working with IIgs programs, games, or development workflows.
GSplus’s free and open-source model keeps adoption straightforward, with no paid tier decisions to weigh. The trade-off is its narrow model coverage and desktop-only deployment: users seeking emulation for other Apple II generations or a different device target should look elsewhere. Prospective users should also plan for the separate ROM-file requirement before setup. Choose GSplus when accurate IIgs focus, debugging access, disk handling, and cross-platform desktop support matter most; choose an alternative when broader Apple II coverage or non-desktop operation is a priority.
GSplus pros and cons
- Where it wins
- Emulates Apple IIgs hardware with the KEGS core across three desktop platforms
- Integrated 65816 debugger includes a terminal REPL for inspecting software
- Drag-and-drop disks, ProDOS host folders, gamepads, screenshots, and CRT effects
- Where it doesn't
- Focuses on Apple IIgs rather than broader Apple II model coverage
- Users must provide their own Apple IIgs ROM file
- Desktop deployment only on Windows, macOS, and Linux
GSplus fact sheet, pricing and score →
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