Flutter and Dart DevTools

DevTools is a suite of performance and debugging tools for Dart and Flutter. Flutter DevTools_ and Dart DevTools refer to the same set of tools.

For a video introduction to DevTools, check out the following deep dive and use-case walkthrough:

Dive in to DevTools

Here are some of the things you can do with DevTools:

• Inspect the UI layout and state of a Flutter app.
• Diagnose UI jank performance issues in a Flutter app.
• CPU profiling for a Flutter or Dart app.
• Network profiling for a Flutter app.
• Source-level debugging of a Flutter or Dart app.
• Debug memory issues in a Flutter or Dart command-line app.
• View general log and diagnostics information about a running Flutter or Dart command-line app.
• Analyze code and app size.

We expect you to use DevTools in conjunction with your existing IDE or command-line based development workflow.

See the VS Code , Android Studio/IntelliJ , or command line pages for instructions on how to launch DevTools.

Question : My app looks janky or stutters. How do I fix it?

Answer : Performance issues can cause UI frames to be janky and/or slow down some operations.

1. To detect which code impacts concrete late frames, start at Performance > Timeline .
2. To learn which code takes the most CPU time in the background, use the CPU profiler .

For more information, check out the Performance page.

Question : I see a lot of garbage collection (GC) events occurring. Is this a problem?

Answer : Frequent GC events might display on the DevTools > Memory > Memory chart. In most cases, it's not a problem.

If your app has frequent background activity with some idle time, Flutter might use that opportunity to collect the created objects without performance impact.

Please give DevTools a try, provide feedback, and file issues in the DevTools issue tracker . Thanks!

For more information on debugging and profiling Flutter apps, see the Debugging page and, in particular, its list of other resources .

For more information on using DevTools with Dart command-line apps, see the DevTools documentation on dart.dev .