It offers features similar to LESS.js or SASS such as variables, mixins and functions.
But it is
- Faster to compile (very simple single pass parser that is less than 300 lines of code), supports any current and future CSS-rules,
- Bundles with own framework - donut
- Has a number of extensions to simplify development process - ui, canvas
- Can be used as build system also (some kind of Makefile but for browser)
- If used as build system can produce JS and CSS files for your web application