EmulatorWorld

Sinclair ZX Spectrum /

JSSpeccy 3 Active

A ZX Spectrum emulator for the browser whose core runs as WebAssembly compiled from AssemblyScript, designed to be embedded in web pages, with 48K, 128K and Pentagon models.

Website Source code

Screenshot of JSSpeccy 3
Emulator World (captured from jsspeccy.zxdemo.org) · GPL-3.0 (screenshot of the project's own web build) · source

Facts

Runs on
Windows, macOS, Linux, Android, iOS
Browser based
License
Open source (GPL-3.0)
System ROMs
Not needed
Mobile
Partial A desktop page that runs in a phone browser, but has no touch keyboard or controls, so it needs a Bluetooth keyboard.
Models
48K, 128K
Opens
.tap .tzx .z80 .sna .szx
Written in
JavaScript, AssemblyScript
First release
2021
Authors
Matt Westcott
Last checked
Oct 2026

Mobile

  • Does not haveOfficial app
  • HasRuns in a mobile browser
  • Does not haveTouch controls
  • Does not haveOn-screen keyboard
  • Unknown:Native keyboard
  • Does not haveBluetooth gamepad
  • Does not havePortrait layout
  • Does not haveLandscape layout
  • Does not haveInstallable
  • Does not haveWorks offline

Has it Doesn't have it Not known yet

Features

  • Not listed:Save states
  • Not listed:Rewind
  • Not listed:Fast-forward
  • Not listed:Run-ahead
  • Not listed:Online multiplayer
  • Not listed:CRT shaders
  • Not listed:A/V recording
  • Not listed:Cheats
  • Not listed:Achievements
  • Not listed:Themes

Input

  • Not listed:Gamepad
  • Not listed:Touch controls
  • Not listed:Light gun
  • Not listed:Mouse
  • Not listed:Positional key mapping
  • HasSymbolic key mapping
  • Not listed:On-screen keyboard
  • Not listed:Native keyboard

Features not listed may still exist. Edit this entry if something is missing or wrong.