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Head-to-head · ZX Spectrum Emulators

Klive IDE vs JSSpeccy 3

  • Updated Oct 2026
  • Both researched from official sources
  • 3 checks side by side
Higher score Klive IDE #5 in ZX Spectrum Emulators 8.9/10 Open source ✓ 2 of 2 features Visit Klive IDE
JSSpeccy 3 #8 in ZX Spectrum Emulators 8.5/10 Free plan Free plan✓ 1 of 2 features Visit JSSpeccy 3

Klive IDE leads on 0 checks, JSSpeccy 3 on 0, and 3 are even. Who comes out ahead on the 3 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreKlive IDE · 8.9/10
  • Free planonly JSSpeccy 3
  • Most featuresKlive IDE · 2 of 2

Klive IDE scores higher on our rubric for zx spectrum emulators: 8.9 against 8.5 out of 10; our editors rank them #5 and #8.

Klive IDE is the better fit for ZX Spectrum development workflows. JSSpeccy 3 is the better fit for instant browser-based emulation.

  • Klive IDE fits best

    ZX Spectrum development workflows

  • JSSpeccy 3 fits best

    Instant browser-based emulation

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Side by side

Feature Klive IDE 8.9/10 Visit ↗ JSSpeccy 3 8.5/10 Visit ↗
At a glance
Editor score 8.9 8.5
Ranking #5 in ZX Spectrum Emulators #8 in ZX Spectrum Emulators
Best for ZX Spectrum development workflows Instant browser-based emulation
Pricing model Free Free
Starting price Open source Free plan
Free plan Not checked yet ✓ (best)
Free trial — —
Deployment Desktop Cloud
Platforms Windows, macOS, Linux Web
Built for Solo, Small business Solo, Small business
Features Klive IDE 2/2 · JSSpeccy 3 1/2
Built-in debugger ✓ (best) Not checked yet
Open source ✓ ✓
Specs
Supported Spectrum models Not checked yet Not checked yet
Host platforms macOS, Windows, Linux web browser
Tape formats .tap, .tzx TZX, TAP
Snapshot formats Not checked yet SZX, Z80, SNA
Peripheral support virtual keyboard, floppy disk drives Not checked yet
Our review
Pros
  • Detailed CPU, memory, disassembly, breakpoint, watch, and BASIC views
  • Built-in Z80 assembler with one-click compile, inject, run, and debug
  • Runs on Windows, macOS, and Linux with ZX BASIC and SJASMPLUS integration
  • Runs 48K, 128K, and Pentagon Spectrum machines in a browser
  • Cycle-accurate scanline and multicolour effects with AY and beeper audio
  • Loads snapshots, tape images, and supported files from ZIP archives
Cons
  • Its development tooling may be more than casual emulation requires
  • Disk loading for .dsk files is specified for ZX Spectrum +3E
  • Project integrations focus on ZX BASIC and SJASMPLUS
  • Web-browser access only; there is no desktop platform
  • Spectrum +2 and +3 are outside its documented machine support
  • Narrower peripheral and debugging coverage than desktop alternatives
Our verdict

Klive IDE combines a desktop ZX Spectrum emulator with an integrated development environment for Sinclair Z80-based computers. It supports ZX Spectrum 48K, 128K, +2E, and +3E models, along with tape loading for .tap and .tzx files and disk…

Read the review →

JSSpeccy 3 is a browser-based ZX Spectrum emulator by Matt Westcott for people who want to run Spectrum software without a desktop installation. It emulates 48K, 128K, and Pentagon machines, handles documented and undocumented Z80…

Read the review →
  1. Klive IDEZX Spectrum Emulators 8.9Open source
  2. JSSpeccy 3ZX Spectrum Emulators 8.5Free plan

Strengths and trade-offs

  • Klive IDE — where it wins

    • Detailed CPU, memory, disassembly, breakpoint, watch, and BASIC views
    • Built-in Z80 assembler with one-click compile, inject, run, and debug
    • Runs on Windows, macOS, and Linux with ZX BASIC and SJASMPLUS integration

    Where it doesn't

    • Its development tooling may be more than casual emulation requires
    • Disk loading for .dsk files is specified for ZX Spectrum +3E
    • Project integrations focus on ZX BASIC and SJASMPLUS

  • JSSpeccy 3 — where it wins

    • Runs 48K, 128K, and Pentagon Spectrum machines in a browser
    • Cycle-accurate scanline and multicolour effects with AY and beeper audio
    • Loads snapshots, tape images, and supported files from ZIP archives

    Where it doesn't

    • Web-browser access only; there is no desktop platform
    • Spectrum +2 and +3 are outside its documented machine support
    • Narrower peripheral and debugging coverage than desktop alternatives

More comparisons

All ZX spectrum emulators comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update