Alive is a very cool Visual Studio extension that lets you visualize the effects of your code as you are typing it. It seems to play with Swift playground.

Alive now supports C#, it runs your code by running your tests. They currently support XUnit, NUnit and MSTest.

Alive runs as fast as your chosen unit test. Usually it runs in less than a second, but we can’t stop you from littering Thread.Sleep() throughout your code. 🙂