Skip to content
SPECIFICTION
Get listed

EmulatorJS

emulatorjs.org

Free plan WebiOSAndroidSelf-hosted
Visit emulatorjs.org
Spec score 8.1 #7 of 29 in Game Boy Advance Emulators

What it is

EmulatorJS is a free, open-source frontend for RetroArch that lets a site owner embed an emulator in a web page. The project provides a code generator, and says the resulting embed can be added with a few lines of code. EmulatorJS uses RetroArch’s libretro cores to run games. Its supported systems documentation includes NES, Nintendo 64, PlayStation, PSP, Sega systems, and Commodore systems, though the project warns that this list may be out of date. Built-in options allow customization, and multiple languages are supported. The project describes EmulatorJS as a library or plugin rather than a standalone website, and it does not provide a Docker container. A public CDN offers paths labeled stable, latest, and nightly. The listed platforms are web, Android, iOS, and self-hosted. Pages must be served through a web server; opening an HTML file directly is unsupported. Threaded cores may improve performance, but need SharedArrayBuffer enabled through COOP and COEP response headers. The 4.3.0-pre release is marked as a prerelease and is discouraged for production use where stability is needed.

Spec sheet

Purpose
EmulatorJS is a web-based frontend for RetroArch that lets users embed an emulator in a website.Read 8 Oct 2026 · emulatorjs.org
Integrations
The project describes itself as a library or plugin rather than a standalone website and says it does not provide a Docker container.Read 8 Oct 2026 · github.com
Support
The project directs users to report issues on GitHub and include browser console logs and the version they use.Read 8 Oct 2026 · github.com
Maker
The site credits @ethanaobrien and @allancoding.Read 8 Oct 2026 · emulatorjs.org
Browser requirement
The FAQ says users must serve the page through a web server; opening the HTML file directly is unsupported.Read 8 Oct 2026 · emulatorjs.org
CDN
The project provides a public CDN with version paths including stable, latest, and nightly.Read 8 Oct 2026 · emulatorjs.org
Code generator
The site provides a code generator for creating embeddable EmulatorJS code.Read 8 Oct 2026 · emulatorjs.org
Customization
The project provides built-in customization options and supports multiple languages.Read 8 Oct 2026 · emulatorjs.org
Embedding
A few lines of code can embed the emulator into a website.Read 8 Oct 2026 · emulatorjs.org
Emulation cores
EmulatorJS uses RetroArch's libretro cores to emulate games.Read 8 Oct 2026 · emulatorjs.org
Open source
The official site describes EmulatorJS as open source.Read 8 Oct 2026 · emulatorjs.org
Performance option
Threaded cores may improve performance, but require SharedArrayBuffer enabled through COOP and COEP response headers.Read 8 Oct 2026 · emulatorjs.org
Release stability
The changelog labels version 4.3.0-pre as a prerelease and advises against using it where production stability is needed.Read 8 Oct 2026 · emulatorjs.org
Supported systems
The supported systems documentation lists platforms including NES, Nintendo 64, PlayStation, PSP, Sega systems, and Commodore systems, and notes that its list may be out of date.Read 8 Oct 2026 · emulatorjs.org

Plans and prices

Free Free Free and ad-free project Read 8 Oct 2026 · github.com

Every EmulatorJS plan and price →

Strong points and limits

Strong points

  • Free and open source
  • Code generator helps create embeddable code
  • Supports multiple languages and customization
  • Public CDN offers stable, latest, and nightly paths
  • Listed platforms include web, Android, and iOS

Limits

  • Pages must run through a web server
  • No Docker container is provided
  • Threaded cores require COOP and COEP headers
  • Supported systems list may be out of date

Who it suits

EmulatorJS suits people who want to add an emulator to a website and adjust its presentation or language. It can also suit users looking for web or mobile access to the listed game systems.

Verdict

EmulatorJS is suited to embedding libretro-based emulation in a website, with a generator and customization options. Plan for web-server hosting, and check the supported-systems documentation before relying on a specific system.

Where Specifiction places it

Alternatives to EmulatorJSAll alternatives →