Want to be able to show up your app in an emulator (or get screenshots) without the Slow Mode banner in the upper-right corner?

Just set debugShowCheckedModeBanner: false on your MaterialApp.


An example from our TodoMVC app:

class TodoApp extends StatelessWidget {
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter • TodoMVC',
      debugShowCheckedModeBanner: false,
      theme: new ThemeData(
        fontFamily: 'Helvetica Neue',
        primarySwatch: Colors.blueGrey,
      home: new SplashPage(),
      routes: <String, WidgetBuilder>{
        '/todos': (BuildContext context) => new TodoList(),