CheerpJ Applet Runner CheerpJ Applet Runner

Version: 10.6
Last Update: 2023-02-08


CheerpJ Applet Runner is a Chrome extension developed by Leaning Technologies Ltd. According to the data from Chrome web store, current version of CheerpJ Applet Runner is 10.6, updated on 2023-02-08.
100,000+ users have installed this extension. 203 users have rated this extension with an average rating of .
developer website:

Run Java applets without installing Java

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 local installation of Java.

Using The CheerpJ Applet Runner is simple. Install the extension, visit your Applet-based website, and enable the extension by clicking on its icon on the upper right corner of your browser!

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 professional Java to HTML5 compiler. More information on CheerpJ are available at

This software is free to use for non-commercial 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].


203 ratings

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avatar Lacroix Jean-Pierre

Une merveilleuse application. Les applets dont je suis l'auteur peuvent de nouveau être utilisées sans problème par quiconque dans le monde entier.

avatar takeda haru

Great Job guys

avatar Mathologer Mathematics

Cut-the-knot is a treasure trove of animated math, animated using java. Finally we are able to enjoy the whole website again. Thank you very much to the developers :)

avatar Steven Strogatz

This extension allowed me to use a suite of Interactive Differential Equations apps that I had not been able to run for years. Thank you, thank you, thank you!!

avatar Στέλιος Παρασυράκης

It is fast and works on most cases