There's a wide variety of tools and features to help debug Flutter applications. Here are some of the available tools:

• VS Code (recommended) and Android Studio/IntelliJ, (enabled with the Flutter and Dart plugins) support a built-in source-level debugger with the ability to set breakpoints, step through code, and examine values.
• DevTools, a suite of performance and profiling tools that run in a browser.
• Flutter inspector, a widget inspector available in DevTools, and also directly from Android Studio and IntelliJ (enabled with the Flutter plugin). The inspector allows you to examine a visual representation of the widget tree, inspect individual widgets and their property values, enable the performance overlay, and more.

You might find the following docs useful:

• Performance best practices
• Flutter performance profiling
• Use a native debugger
• Flutter's modes
• Debugging Flutter apps programmatically