Tool Profile

CheerpJ Applet Runner

A browser extension that runs legacy Java applets through WebAssembly.

At a glance:

First seen:2026-07-12

Last seen:2026-07-12

Sightings:1

Source:cheerpj.com

What it is

A browser extension that runs legacy Java applets through WebAssembly.

Why developers recommend it

It preserves old educational software without requiring a full rewrite.

Hacker News evidence

2026-07-12

A commenter highlighted it as a longstanding solution for running educational Java applets in modern browsers.

Old and new apps, via modern coding agents