It uses CoffeeScript's grammar, so there's no need to learn a new one or switch between two different grammars as you work. It's also way less code than Haml.

It uses CoffeeScript's grammar, so there's no need to learn a new one or switch between two different grammars as you work. It's also way less code than Haml. CoffeeKup's src folder is 240 lines of code.