GZX review
A free, focused emulator with useful tape, snapshot, audio and debugging support.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
GZX is an open-source ZX Spectrum emulator developed by Jiri Svoboda for people who want straightforward emulation on Windows or Linux. It covers the 48K, 128K, +2 and +2A Spectrum models, giving users a focused way to run software associated with several classic Spectrum configurations. The project is free and distributed under an MIT-style license, with source code and binaries available for desktop systems.
Its feature set goes beyond basic model emulation. GZX supports TZX, TAP and WAV tape formats, along with Z80, SNA and AY snapshots. Kempston joystick emulation covers a familiar control option, while AY sound emulation and ULAplus support add compatibility for specific Spectrum capabilities. A built-in debugger is useful for users who need to inspect or troubleshoot software rather than only run it. Audio recording to WAV and I/O port output recording also give the emulator practical tools for documentation, development or preservation work.
GZX is a good fit for users who value free, open-source software and want a compact Windows or Linux emulator with debugging, recording and core tape and snapshot support. The project also provides build instructions for HelenOS, although its listed desktop platforms are Windows and Linux. Buyers looking for wider platform, model or peripheral coverage should choose a broader emulator instead. GZX makes the most sense when its focused support for classic Spectrum models, common image formats, AY audio, ULAplus and selected peripherals matches the intended use.
GZX pros and cons
- Where it wins
- Supports 48K, 128K, +2 and +2A Spectrum models
- Handles TZX, TAP, WAV, Z80, SNA and AY formats
- Includes AY audio, ULAplus, MIDI and a built-in debugger
- Where it doesn't
- Desktop support centers on Windows and Linux
- Coverage is narrower than broader emulator alternatives
- Peripheral support focuses on Kempston joystick and MIDI
GZX fact sheet, pricing and score →
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