Midscene.js

Your AI Operator for Web, Android, Automation & Testing

Midscene.js allows AI to serve as your web and Android operator 🤖. Simply describe what you want to achieve in natural language, and it will assist you in operating the interface, validating content, and extracting data. Whether you seek a quick experience or in-depth development, you’ll find it easy to get started.

Showcases

📢 2025 Feb: New open-source model choice - UI-TARS and Qwen2.5-VL

Besides the default model GPT-4o, we have added two new recommended open-source models to Midscene.js: UI-TARS and Qwen2.5-VL. (Yes, Open Source models !) They are dedicated models for image recognition and UI automation, which are known for performing well in UI automation scenarios. Read more about it in Choose a model.

💡 Features

• Natural Language Interaction 👆: Just describe your goals and steps, and Midscene will plan and operate the user interface for you.
• UI Automation 🤖
  • Web Automation 🖥️: Start in-browser experience immediately through the Chrome extension, or integrate with Puppeteer and Playwright.
  • Android Automation 📱: Use the Android playground to start experience immediately, or integrate javascript SDK with adb.
• Visual Reports for Debugging 🎞️: Through our test reports and Playground, you can easily understand, replay and debug the entire process.
• Support Caching 🔄: The first time you execute a task through AI, it will be cached, and subsequent executions of the same task will significantly improve execution efficiency.
• Completely Open Source 🔥: Experience a whole new automation development experience, enjoy!
• Understand UI, JSON Format Responses 🔍: You can specify data format requirements and receive responses in JSON format.
• Intuitive Assertions 🤔: Express your assertions in natural language, and AI will understand and process them.

✨ Model Choices

You can use multimodal LLMs like gpt-4o, or visual-language models like Qwen2.5-VL, gemini-2.5-pro and UI-TARS. In which UI-TARS is an open-source model dedicated for UI automation.

Read more about Choose a model

👀 Comparing to …

There are so many UI automation tools out there, and each one seems to be all-powerful. What’s special about Midscene.js?

• Debugging Experience: You will soon realize that debugging and maintaining automation scripts is the real challenge. No matter how magical the demo looks, ensuring stability over time requires careful debugging. Midscene.js offers a visualized report file, a built-in playground, and a Chrome Extension to simplify the debugging process. These are the tools most developers truly need, and we’re continually working to improve the debugging experience.

• Open Source, Free, Deploy as you want: Midscene.js is an open-source project. It’s decoupled from any cloud service and model provider, you can choose either public or private deployment. There is always a suitable plan for your business.

• Integrate with Javascript: You can always bet on Javascript 😎

📄 Resources

• Home Page: https://midscenejs.com
• Web Browser Automation
  • Quick Experience By Chrome Extension
  • Automate with Scripts in YAML
  • Bridge Mode by Chrome Extension
  • Integrate with Puppeteer
  • Integrate with Playwright
• Android Automation
  • Quick Experience by Android Playground
  • Integrate with Android(adb)
• API Reference
• Choose a model
• Config Model and Provider

🤝 Community

• Discord
• Follow us on X
• Lark Group

📝 Credits

We would like to thank the following projects:

• Rsbuild for the build tool.
• UI-TARS for the open-source agent model UI-TARS.
• Qwen2.5-VL for the open-source VL model Qwen2.5-VL.
• scrcpy and yume-chan allow us to control Android devices with browser.
• appium-adb for the javascript bridge of adb.
• YADB for the yadb tool which improves the performance of text input.
• Puppeteer for browser automation and control.
• Playwright for browser automation and control and testing.

Citation

If you use Midscene.js in your research or project, please cite:

@software{Midscene.js,
  author = {Xiao Zhou, Tao Yu, YiBing Lin},
  title = {Midscene.js: Your AI Operator for Web, Android, Automation & Testing.},
  year = {2025},
  publisher = {GitHub},
  url = {https://github.com/web-infra-dev/midscene}
}

📝 License

Midscene.js is MIT licensed.