Troubleshooting DartPad

This page describes solutions to problems that might occur when you’re trying to use DartPad, whether at or in a page that has embedded DartPads.

Embedded DartPads on are slow in Safari

Try using another major browser that Dart supports, such as Firefox, Edge (dev channel), or Chrome. This issue is being tracked in the WebKit issue tracker.

More information

Embedded DartPads don’t appear

The homepage and many codelabs have embedded DartPads. If these DartPads don’t appear at all, then try the following:

  • Make sure you’re using a supported browser. DartPad might not work in other browsers, and is known not to work in the default configuration of the Brave browser.

  • If you’re using an ad blocker, disable it.

  • If you don’t use an ad blocker, check whether you’ve disabled third-party tracking cookies (Chrome instructions). If you’ve disabled cookies, change your settings to allow cookies for

    DartPad doesn’t use cookies, but it does rely on local storage, which browsers generally disable when you disable cookies.

DartPad doesn’t work in China


Other issues

If you have any other problems when using DartPad, create an issue on GitHub.