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

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

Watch on YouTube in a new tab: "Dive in to Flutter and Dart 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.
• Validate deep links in your Android or iOS app.

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

You can launch DevTools with the following tools:

• VS Code
• Android Studio/IntelliJ
• command line

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

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

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

For more information, check out thePerformance 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 theDevTools issue tracker. Thanks!

DevTools is distributed as part of the Flutter SDK. To get access to the latest DevTools functionality, runflutter upgrade to get the most up-to-date version of Flutter. To access DevTools features before they hit the Flutterstable channel, consider switching to thebeta ormain channels.

For more information on debugging and profiling Flutter apps, see theDebugging page and, in particular, its list ofother resources.

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