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The Ultimate Script Engine for
Enhanced Browser Experience

ScriptCat is a powerful open-source browser script engine that lets you easily customize web functionality, eliminate ads, automate tasks, and enhance your browsing experience. Compatible with Tampermonkey and provides more features and optimizations.

A browser extension for executinguser scripts, activating infinite possibilities for your browser!

script.js - ScriptCat
// ==UserScript==
// @name Auto Dark Mode
// @namespace http://scriptcat.org
// @version 1.0
// @description Automatically enable dark mode on websites
// @author ScriptCat User
// @match *://*/*
// ==/UserScript==

function enableDarkMode() {
const css = `body { background-color: #121212; color: #e0e0e0; }`;
const style = document.createElement('style');
style.textContent = css;
document.head.appendChild(style);
console.log('🐱 ScriptCat: Dark mode enabled');
}

function isDarkModePreferred() {
return window.matchMedia('(prefers-color-scheme: dark)').matches;
}

if (isDarkModePreferred()) {
enableDarkMode();
}

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Powerful Features, Infinite Possibilities

ScriptCat provides a series of powerful features that allow you to easily extend your browser's capabilities and create your own web experience.

Tampermonkey Compatible

Fully compatible with Tampermonkey script format, seamlessly migrate existing script libraries with zero cost switching.

Background Scripts

Unlike regular user scripts, allows your scripts to run continuously in the background without needing to open tabs.

Safe and Reliable

Strict permission control system, transparent script behavior, effectively prevents malicious scripts and protects your privacy.

Built-in Code Editor

Powerful code editor with syntax highlighting, code completion, and error hints to make script writing more efficient.

Powerful APIs

Provides richer API interfaces than GM, supports advanced features like file storage and user configuration, extending script capabilities.

Script Store

Features a script store for one-click installation of popular scripts, or publish your works to share with the community, building an active ecosystem.

Why Choose ScriptCat

Compared to other script engines, ScriptCat provides more advantages and enhanced features

Feature
Icon
ScriptCat
Tampermonkey
Script Compatibility
Background Scripts
Efficient
Open Source Free
Cloud Sync
Multi-platform
More APIs
Community Support

Scripts That SolveReal Problems

See how ScriptCat can transform your browsing experience

Video Site Enhancement

Optimize video viewing experience

Popular Apps
Video Speed Control
One-click Video Download
Auto Skip Ads
UI Simplification
Supported SitesGet Script →
Bilibili
Youtube
Netflix
+More

Shopping Assistant

Make shopping experience easier

Practical Tools
Price History Query
Auto Coupon Search
Price Comparison
Price Drop Alert
Supported SitesGet Script →
淘宝
京东
亚马逊
+More

Ready toEnhance Your Browsing Experience?

Install ScriptCat now and unlock infinite possibilities for web browsing

Edge Extension StoreChrome Extension StoreFirefox Extension StoreGitHub Download
https://scriptcat.org
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ScriptCat Enabled

3 scripts are running on current page

Thanks to all contributors