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EmulatorJS

Free#5 of 53 in Multi-System EmulatorsSega CD Emulators Emulation Frontends Sega Genesis Emulators +1 more

EmulatorJS: A broad, open-source browser emulator for embedded retro-system play, without current netplay. Ranked #5 of 53 in Multi-System Emulators by our editors (8.5/10); pricing: Open source; best for websites needing broad browser emulation.

8.5/10Editor score

Visit EmulatorJS

EmulatorJS8.5 Visit EmulatorJS

At a glance

Editor score
8.5 / 10
Pricing
Open source
Best for
Websites needing broad browser emulation
Paid from
Free
Supported systems
36
Facts checked
20 Sep 2026

Where it wins
- Embeddable WebAssembly RetroArch cores cover 36 systems.
- Includes save states, recording, cheats, shaders, and cache management.
- Maps keyboards and controllers for up to four players.
Where it doesn't
- Netplay is not currently supported.
- Its scope centers on web embedding, not standalone ROM management.
- The JavaScript and WebAssembly approach suits web projects more than native apps.

Our verdict on EmulatorJS

EmulatorJS is an open-source JavaScript framework for developers who want to embed playable retro-system emulation into websites. It uses RetroArch libretro cores compiled to WebAssembly and provides generated embed code for browser-based operation. The project also supports self-hosting on a web server, with platform coverage spanning web, iOS, Android, and self-hosted deployments. It is best suited to websites and digital projects that need configurable emulation rather than a standalone ROM-management server.

Its main strength is the breadth of the embedded feature set. EmulatorJS verifies support for 36 systems, including arcade systems, while offering ROM drag-and-drop loading, save-state saving and loading, screen recording, cheat-code menus, custom shaders, and browser cache management. Keyboard and controller mapping supports up to four players, and the interface is multilingual. RetroArch cores compiled to WebAssembly make the emulator suitable for browser delivery, while shader support adds room for visual customization. These capabilities give developers several control and presentation options within one embeddable component.

The key limitation is networked multiplayer: netplay is not currently supported, even though related documentation includes server setup instructions and the roadmap lists the feature as in development. That makes EmulatorJS a weaker fit for projects centered on online multiplayer sessions. Its JavaScript and WebAssembly foundation also places the emphasis on web integration and self-hosting, so teams seeking a native standalone emulator package or a dedicated ROM-management server should consider a different category of tool. Choose EmulatorJS when website embedding, broad system coverage, and customizable browser playback matter most.

Your product? Our editors can test EmulatorJS in depth and publish a review, labelled as paid · from $149/mo →

EmulatorJS pricing

Plans Open sourceFree Free to use — no paid tier required for the core job.

See plans on emulatorjs.org

EmulatorJS fact sheet

Free plan	Not verified
Paid from	Free
Supported systems	36
Android support	Yes
Arcade support	Yes
Netplay	No
BIOS required	Not verified
Shader/upscaling	Yes
License	Open-source
Deployment	Self-hosted
Platforms	Web, iOS, Android
Support	Community, Docs
Built for	Small business, Mid-market, Enterprise (editorial estimate)
Pricing	Open source
Website	emulatorjs.org
Facts checked	20 Sep 2026

Alternatives to EmulatorJS

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EmulatorJS vs the competition

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Also Ranked In

EmulatorJS is ranked in 5 of our directories.

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Featured on iTechGuides

EmulatorJS is listed in our Multi-System Emulators directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update