CheerpJ Applet Runner

Run Java applets without installing Java

CheerpJ Applet Runner - Run Java Applets Easily

"CheerpJ Applet Runner" is a Chrome extension that allows users to run legacy Java Applets in modern browsers without needing a Java installation. It converts applets to WebAssembly and JavaScript on the fly, providing a seamless experience that is fully client-side, secure, and private. Developed by Leaning Technologies, it is suitable for non-business use on public networks, ensuring that all data remains within your browser. For internal or business use, licensing options are available.
Install from Chrome Web Store

Extension stats

Users: 100,000+
Version: 2024.11 (Last updated: 2024-12-02)
Creation date: 2020-02-06
Risk impact: Very low risk impact
Risk likelihood:
Manifest version: 3
Permissions:
  • scripting
  • activeTab
  • storage
Size: 125.83M

Other platforms

Not available on Android
Not available on Firefox
CheerpJ Applet Runner (v2024.10)
3.60 (16) 35,180+
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Extension summary

CheerpJ Applet Runner - Run Java applets without installing Java

With the CheerpJ Applet Runner extension, you can run legacy Java Applets on modern browsers without a Java plugin or a Java installation.

Using the CheerpJ Applet Runner is simple. Just install and pin the extension. Next, visit your Applet-based website, click the extension icon in the upper-right corner of your browser, and then press the 'Enable' button in the popup. Once enabled, the extension is activated for the current domain, and Applets will start automatically if they are present.

This extension works by 'converting' the Java Applet to WebAssembly and JavaScript on the fly. It is private and secure, runs fully client-side (i.e. it does not contact any server), and does not collect any data or analytics at all. All your data, as well as your application are kept within the boundaries of your browser.

This extension, developed by Leaning Technologies, is based on CheerpJ, a JVM/JRE replacement for modern browsers. More information on CheerpJ are available at https://www.cheerpj.com.

This software is free to use for non-business purposes on public-network Applets. For any other use, such as internal network applets, or if you are a company or public-sector organisation and would like to license CheerpJ, please get in touch with [email protected].

User reviews

These summaries are automatically generated weekly using AI based on recent user reviews. Chrome Web Store does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
Pros
  • Allows access to Java Applets that were previously inaccessible.
  • Works well with specific applications, such as HPE Switches.
  • Simple and effective interface.
  • Good performance compared to old browsers running Java applets.
Cons
  • Some applets do not work or load properly.
  • Performance can be slow at times.
  • Requires explicit enabling for each applet visit.
Most mentioned
  • Not all Java applets work.
  • Applets can be slow.
  • Effective for restoring access to old Java-based tools.
User reviews
by josep ignasi, 2024-11-30

This applet runner allowed me to use the java based web configurator on an old procurve switch. Top Drawer!!
by Nick Warrington, 2024-11-29

Remarquable application qui contourne brillamment la disparition de Java pour les figures Cabri-Géomètre. Grand merci !
by Serge du 30, 2024-11-21
View all user reviews

Extension safety

Risk impact

CheerpJ Applet Runner does not require any sensitive permissions.

Risk likelihood

CheerpJ Applet Runner is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this extension.

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Promo images

CheerpJ Applet Runner small promo image
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