According to the company, Google Pay switched to Flutter a few months ago and the engineering team was able to get rid of half a million lines of code tied to features for specific platforms. Flutter is also gaining traction at other companies. At Flutter Engage, Canonical is expected to show off a new Ubuntu installer app built with Flutter. And Microsoft is planning to add code contributions to the Flutter engine to support foldable Android devices. One of the criticisms of Flutter for the web, at least during the beta stage, was that Flutter web apps are more like Flash files than traditional HTML, CSS, and JavaScript. That's because they're displayed via Flutter's CanvasKit, which uses Skia graphics compiled to WebAssembly and rendered using WebGL. The result is not human-readable code that can be scrutinized via the browser's View Page Source command.