We had this question earlier in a reddit submission so copying and pasting the answer here (so that you don't think I'm being insincere!) - We fully support styledComponents, or any valid React for that matter. You can even use utility CSS classes in code. The design tool can edit some of these today already (e.g. you can pass in additional styles to a component instance). Better support for creating and managing styledComponents / Emotion is high on our roadmap so watch this space!