I’m building a UI design app similar to Figma or Sketch, but with a few differences:

1. Responsive artboards and flex-like layout engine

2. Deep support for design tokens

3. HTML/CSS previews and export

4. Multiplayer AI and human collaboration. Agents can connect to documents and collaborate like any other user.

Built in Swift and cross platform Mac, iPad and iPhone.

I’m designing and building the UI and implementing the underlying features with Codex. So far it’s going surprisingly well.