The Qt framework is over 25 years old, and in that time many different technologies have been developed to create graphical user interfaces. This talk aims to lay out what is current landscape of available GUI APIs, and give a better impression of which should be should be used and when, as well as which should be avoided and possible migration paths for existing code. The APIs that we will dive include: QWidgets QPainter QGraphicsView Qt Quick 1 Qt Quick 2 Qt Quick Controls 1 and 2 QWindow OpenGL, Vulkan, Direct3D For each API we will discuss what the API consists of, what features it offers, and what problem it was created to solve. In addition I can give examples of where each API makes sense to be used, as well as some reasons why it can be a bad idea to pick a particular API. The objective is to break the curse of choice that comes with such a flexible framework as Qt and give you a better idea of how to proceed making the best GUI for your application or device.