EmulatorJS vs gbajs3

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NES, Nintendo 64, PlayStation, PSP, Sega systems, and Commodore systems, though the project warns that this list may be out of date.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.

gbajs3 is a free, browser-based Game Boy Advance emulator for modern browsers, with no plugins required. It offers interchangeable mGBA WebAssembly and pure JavaScript gbajs cores. Both cores support a realtime clock. Controls include remappable keyboard bindings and virtual controls for desktop and mobile, alongside mobile interface support and offline progressive web app support. Fast forward is included. Save states and cheat codes work with the mGBA core, while a surface-level assembly debugger is available with the gbajs core. The project also lists a Go server for logged-in users, an Nginx server for content, an admin interface and PostgreSQL support. Self-hosting uses an environment file and Docker Compose. The setup guide says the default admin password is admin and instructs changing it after login. The README marks debugger and server enhancements as unfinished, and GitHub lists no releases.