Claude Code for designers.
Claude Code is a coding agent, and on its own it lives in a terminal. Prototo Desktop puts it inside a design harness: a native iOS project that is ready to go, Prototo's design guidance, and a live iPhone preview beside the agent. You describe, look and decide. Codex works the same way.
What changes for a designer
- No terminal setup: Prototo Desktop creates the project and starts the preview.
- No blank page: the agent starts from a working native app and design profiles for color, type and spacing.
- No guessing: every change appears in the live iPhone preview as it is made.
- No handoff: Publish shares what you designed as a link that runs natively on any iPhone.
Set it up
- Install Xcode from the Mac App Store and sign in to Claude Code or Codex on the plan you have.
- Download Prototo Desktop from prototo.app/download and open it.
- Create a new prototype. Prototo sets up the project and opens the live iPhone preview beside the agent.
- Describe what you want to design. The agent follows Prototo's design guidance as it builds.
Working habits that help
- Keep one change per prompt and check it in the preview before the next.
- Keep DESIGN.md current. It is how the agent remembers your decisions between sessions.
- Review on a real iPhone before you share. Gestures and haptics only feel right on the device.
Keep reading
Download Prototo for Mac. Free to build, and viewers get the free Prototo app on iPhone.