The Dart code is to the left and the web display is to the right. IDG Figure 1. A Flutter Material widget example using DartPad. Figure 2 shows an example of gesture handling in Flutter.

Flutter is Google's UI framework for building iOS, Android, Fuchsia, the web and now more desktop apps. The promise of Flutter is that developers can target multiple platforms with a single code base.

Google is announcing a number of new features for Flutter, which hit its 3.0 milestone at last year's I/O and is now launching version 3.10.