Sorry for the late response. Quasar is a great project and I certainly don’t mean to violate the wishes of the core project team. But, as far as I can tell, there is no supported way to use a font created with Fontello, and the project I’m working on needed some icons that weren’t part of the supported sets. I did suggest a fix for future development (defining custom font prefixes in quasar.conf.js), but given that we are presently right between 0.17 and 1.0 beta I am not comfortable creating a PR because I don’t want to break backwards compatibility, nor do I want to introduce new features during a beta/RC phase. Or when the app-extension docs are available, I can look into that.