Does qt charge?

Qt used to be charged, but since September, 2002 1,1,Qt Company has made major changes to the Qt license, and now Qt is free. Qt company provides a variety of licenses, including commercial licenses and open source licenses. For commercial products, you can choose to buy a commercial license, while for open source projects, you can choose to use the open source LGPL/GPL/ commercial license. This means that developers can use Qt for free as long as they meet the corresponding licensing requirements. So it can be clearly answered that Qt is free now.