From Idea to Clickable App Mockup (in a Couple of Hours), ChatGPT + Claude Workflow

I’ve been experimenting with Claude to see how far we can push “mockups” toward functional, tappable UI demos—the kind you can actually click through to feel the flow. Paired with ChatGPT (for a crisp functionality doc), this has become my favorite way to help product folks and UI/UX designers validate an app idea fast.

Below is a full tutorial with copy-paste prompts, my example app, and a step-by-step workflow you can follow to go from “vague concept” to a clickable, mobile-style mockup in an afternoon.

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**Check out the mockup first to see what I was able to achieve in 15 minutes of prompting.

Imagine what you can do with a bit more time and effort!**

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Now let’s go through the process →

What you’ll end up with

• A structured functionality doc (screens, flows, states, and acceptance criteria).
• A single-file mobile web mockup from Claude (HTML/CSS/JS) with:
  • Multiple screens
  • Functional buttons / nav
  • Modals, forms, toasts
  • Basic state handling and transitions
• A repeatable prompt pack you can reuse on any new app idea.

No design tool required. You’ll get something you can open locally in a browser and click through like a real app.

The high-level workflow

1. Scope & structure with ChatGPT → produce a tight, testable functionality doc.
2. Generate a tappable mockup with Claude → use the doc as the single source of truth.
3. Iterate in small loops → tweak theme, layout, and flows with surgical prompts.
4. Polish for demo → inject sample data, empty/error states, and polish transitions.