It would have been great to point out at the beginning of the article that this sketch software is for Mac only. Serious web development is not only done in Mac, did you know?
You are right, I should have said that in the article. I'll edit it.
How times change
I remember in 2001 a friend of mine brought his black Apple laptop at work because he wanted to work with it to do a web application in Java. Everyone laughed at him. Now if I see someone with a thick Dell or IBM laptop it's the exception.