In a Web Application and Mobile (hybrid), how to know which this platform running?

 needed depending on the platform to change the CSS to suit the size of the font.

 for example the DbGrid

Hi

 You can try this js code to check platform. Add MainForm's Script properties.

  var userAgent = navigator.userAgent || navigator.vendor || window.opera;

  if( userAgent.match( /iPad/i ) || userAgent.match( /iPhone/i ) || userAgent.match( /iPod/i ) )
  {
		//call your css in here for ios

  }
  else if( userAgent.match( /Android/i ) )
  {
	//call your css in here for android
 }
  else
  {
   //call your css in here for other
  }
}

But why do you check platform? You can change css rules using media queries in css.

For example

@media screen and (min-width: 480px) {
    body {
        background-color: lightgreen;
    }
}

also you can create an hybrid project. Examine Demos/Touch/Hybrid demo.

 And you can change layout on clientside. Examine Demos/Desktop/Clientside Alignment - ... demos.

On server side you can use :

UniApplication.UniPlatform: TUniPlatforms

TUniPlatform = (upDesktop, upMobile, upPhone, upTablet, upAndroid, upiPhone, upiPad, upiPod, upiOS);
 TUniPlatforms = set of TUniPlatform;