CheerpJ Applet Runner

Run Java applets without installing Java
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CheerpJ Applet Runner - Run Java Applets Easily

"CheerpJ Applet Runner" is a browser extension that enables you to run legacy Java applets without a Java installation or plugin. It converts Java applets to WebAssembly and JavaScript on the fly, ensuring a secure, client-side experience. Developed by Leaning Technologies, this tool is free for non-business use and safeguards your data, running entirely within your browser. For more information or licensing for internal use, visit https://www.cheerpj.com.
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Add-on stats

Manifest V3
Users: 32,425
-139
Rating: 3.70
(18)
Version: 2024.10 (Last updated: 2024-11-07)
Creation date: 2021-09-06
Permissions:
  • scripting
  • activeTab
  • storage
Size: 126.39M
Full description: See detailed description

Ranking

# 840 ▼ 11
Other rankings
#68 in present keyword 30 #136 in network keyword 19 ▲ 7 #164 in analytics keyword 68 ▼ 4 #173 in license keyword 4 ▼ 4 #176 in company keyword 11 ▲ 3

Other platforms

CheerpJ Applet Runner (v2025.3)
100,000 4.52 (268)
Not available on Android
Not available on Firefox

User reviews

These summaries are automatically generated weekly using AI based on recent user reviews. Edge Add-on Store does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.
Pros
  • Can run Java applets on Edge and Chrome, enabling access to older websites that require Java.
  • Useful for specific government sites that only run on Java, providing a stable alternative to Internet Explorer.
  • Has improved functionality over previous versions, allowing users to interact with legacy content.
Cons
  • Many users report that the add-on does not work at all or fails to launch Java applets.
  • The add-on often hangs, requiring users to reload the page and applet multiple times.
  • Users experience frustration with having to manually click to enable the add-on on each page, despite settings indicating otherwise.
Most mentioned
  • Does not work or fails to launch applets reliably.
  • Functionality improvement compared to previous versions, especially for specific websites.
  • Users request more seamless integration, such as staying active without needing to click.
User reviews
This new version doesn't work anymore :(
by family, 2025-03-02
Tried on 4 different old websites that needed Java to run some features and worked like a charm
by Luis, 2025-02-28
Doesn't work at all. Acts like it's going to start the applet, but never actually does.
by R, 2024-04-07
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Add-on safety

Risk impact

CheerpJ Applet Runner does not require any sensitive permissions.

Risk impact analysis details
  • Low Request access to the following domains:
Risk likelihood

We don't have sufficient data to confidently determine the risk likelihood of CheerpJ Applet Runner. Use it at your own risk.

Risk likelihood analysis details
  • High This extension has low user count. Unpopular extensions may not be stable or safe.
  • Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
  • Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
  • Good **** ********* *** **** **** *******
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Promo images

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