Dart is a client-optimized language for fast apps on any platform
Supported by Google

Dart is free and open source  

for UI
Develop with a programming language specialized around the needs of user interface creation
Make changes iteratively: use hot reload to see the result instantly in your running app
Fast on all
Compile to ARM & x64 machine code for mobile, desktop, and backend. Or compile to JavaScript for the web

Try Dart in your browser

Want more practice? Learn the language, explore the core libraries, or build a command-line app.