ScriptCat is an extension that lets you automate the repetitive actions you normally perform on websites according to your own rules. For example —
- Automatically check prices on online shops
- Skip ads on video sites
- Automatically organize frequently opened pages
- Auto-fill forms you repeatedly enter and other small hassles can be taken care of automatically.
You don't need to build a special app. With ScriptCat, you can run your own scripts (small automation programs) directly on websites.
Basic features of ScriptCat
| Feature | What it lets you do |
|---|---|
| 💻 Run your own scripts | Add rules like “when this button is pressed, do X” |
| 🔁 Background operation | Keep running automatically even if the tab is closed |
| ☁️ Cloud sync | Keep your settings when you switch PCs or browsers |
| ✍️ Built-in editor | Includes an editor to write and test scripts; easy to edit even for beginners |
| 🧱 Shared store | Add useful scripts created by others with one click |
💡 Example uses
| Scenario | What you can automate |
|---|---|
| Online shopping | Automatically check for price drops and notify you |
| Video sites like YouTube | Skip ads, change playback speed |
| Daily tasks | Automate morning check-ins or form submissions |
| Your blog or admin panels | Make frequent updates or registrations one-click |
The appeal of ScriptCat is that you can automate these processes with your own personal rules. For anyone who spends a lot of time on the same manual actions, it's a true time-saver.
🧠 How to use
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Install the extension Add "ScriptCat" from the ScriptCat page on the Chrome Web Store.
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Allow user scripts to run Depending on your browser settings, you may need to enable "Allow user scripts" before scripts can run. Please follow these steps:
- Enter
chrome://extensions/in the Chrome address bar and open it. - Turn on "Developer mode" in the top right.
- Find "ScriptCat" in the list and click "Details".
- Turn on "Allow user scripts".
- Restart the browser after changing the setting.
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Add a script Open ScriptCat's management interface and add a script by selecting "Create new script". If you prefer to use scripts published by others, you can install them from the built-in "Script Store".
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Edit and run scripts You can edit scripts in the built-in editor. It supports syntax highlighting, auto-completion, and error checking (ESLint), making it beginner-friendly. When your setup is complete, click "Save" and open the target website — the script will run automatically.
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Background execution and sync If you want a script to run continuously, enable "Background execution". ScriptCat also supports cloud synchronization, so your settings carry over when you change PCs.
What users say about ScriptCat
- Developed in China, it supports backend and timed scripts and offers features Tampermonkey lacks.
- Its clean UI makes it efficient to manage a large number of scripts.
- Background operation reliably handles tasks like form auto-fill and price checking.
- Promising as an alternative to Tampermonkey, with easy script migration.
- Script editing is smooth thanks to syntax highlighting, autocomplete, and ESLint support.
The evaluation points converge on stability, ease of use, ease of migration, and rich editing features.
My impression
It’s made in China and might seem a bit suspicious, but it’s open source, so it should be fine! If you want to customize a website a little, you can inject your own scripts. There is a script store, which you can use as needed…
By the way, I don't use it myself.
Security and privacy
According to ScriptCat's privacy policy (here), data collection is limited to what is necessary to provide the functionality. It explicitly states that there is no secondary use of personal information or unnecessary data transmission, and user data privacy is respected. It handles only the minimum information required for browser automation to ensure safety. If you are concerned about Chrome extension security, you can use it with confidence.
Summary: ScriptCat is a reliable partner for browser automation
ScriptCat combines Tampermonkey-compatible script management with continuous background execution, a wide API surface, convenient cloud sync, and a powerful editor, offering a feature-rich Chrome extension. It is suitable for various browser automations such as skipping ads on video sites or checking prices on online stores, and it helps streamline user script management. ScriptCat is a promising option for future browser automation tools and can further enhance the convenience of Chrome extensions.
Check installation and more details on the official page.
Hatena
