Dart team member here - Also, have you checked out http://flutter.io ? I'm personally pretty compelled (and have been for a long time) by being able to share code/tools/etc between web and native mobile. The quality of the dev experience in flutter is pretty amazing (check out Eric Seidel's video from day 2 of the Dart Dev Summit [just concluded], and the web experience with the Dart dev compiler is pretty neat, too.