It’s used to control a USB serial device(Arduino, ESP32, ESP8266, Srial servo and so on) with graphical user interface. The user interface is built with html and JavaScript and it can be customized through web browser. With this app you can easily create a beautiful, functioning interface for your Microcontroller Projects. No struggle for display, button, power source. JavaScript is very easy to use, you can do the logic with JavaScript and let microcontroller to do the basic functions.