We're using CSS Hat engine to run the code export in Avocode, that way we can guarantee the best code output you can get.
Avocode outputs pure standards-based CSS3 (and optionally vendor-prefixed properties for all major browsers), LESS, SASS and Stylus. You can also create your custom templates for your preferred languages like in CSS Hat.
To change the language in the Desktop app, go to the Code section in Settings and select your language in the "Preferred language" dropdown.
NOTE: The language you choose will globally change in all code outputs in all your projects.