StopTheScript is a Safari extension for iOS, iPadOS, and macOS that stops all JavaScript on your selected websites. StopTheScript is the only Safari extension that stops inline JavaScript on the web page as well as externally loaded JavaScript. This is in contrast to Safari content blockers, which can only block external JavaScript, not inline JavaScript.

System Compatibility:

• iOS and iPadOS 15 through 26
• macOS 12 Monterey through 26 Tahoe
  Safari 17 or later is required on macOS

Why StopTheScript? Where and why I use StopTheScript

Tutorial: A short StopTheScript tutorial

Demo:

If you're already using a Safari content blocker to block JavaScript, then set it to block JavaScript on this website (underpassapp.com), and click the button below. If the button still pops up an alert, then your JavaScript blocker is incomplete, and you need StopTheScript!

Here's the code for the button:

<div>
<button id="mybutton" type="button">
Click for inline JavaScript
</button>
</div>
<script>
function MyClick(event) {
alert("JavaScript alert() is running!");
}
document.getElementById("mybutton")
.addEventListener("click", MyClick);
</script>

Noscript:

StopTheScript has a setting to bypass HTML <noscript> elements that can detect disabled JavaScript. Try this test page for a demo.

About the developer:

Jeff Johnson, owner of Underpass App Company, had 15 minutes of fame for solving the Mac OCSP appocalypse. Before becoming an indie developer, Jeff was a longtime engineer at Rogue Amoeba Software and also worked on the open source RSS reader Vienna.