Software development tool
Also known as GUI builder · GUI designer · graphical user interface designer · RAD IDE · user interface builder
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A graphical user interface builder, also known as GUI designer or sometimes rapid application development (RAD) integrated development environment (IDE), is a software development tool that simplifies creating graphical user interfaces (GUIs) by allowing a designer to arrange graphical control elements using a drag-and-drop WYSIWYG editor. Without a GUI builder, a GUI must be built by manually specifying each widget's parameters in the source code, with no visual feedback until the program is run.