Hatari now runs fully in a web browser, delivering an online emulator for the classic Atari ST/STE/TT/Falcon computers. The project compiles the original Hatari source to WebAssembly, allowing users to launch the system with a single click and interact via keyboard or gamepad. No download or configuration is required, turning a platform into a web app. It also supports saving disk images to local storage.

Running legacy code in the browser showcases how WebAssembly bridges old architectures and modern web standards. By exposing the ST’s 68000 CPU, custom chips and audio subsystem, developers can debug vintage software directly in Chrome or Firefox. This approach also preserves digital heritage, letting researchers archive and examine operating systems without preserving physical hardware. The compilation yields low latency input and native frame rates.

For hobbyists, the Hatari web build removes the need to install emulators on Windows, macOS or Linux, simplifying game preservation and demo creation. Educators can embed a functional Atari environment into tutorials, and open‑source contributors gain a testbed for improving cycle‑accuracy or adding peripheral support. The service now offers immediate, cross‑platform access to classic Atari software. It runs on any browser.