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Claude 4 Just One-Prompted This Miro Whiteboard Clone (Tutorial)

Pat Simmons
Author
Pat Simmons
Updated: Aug 23 2025Reading time: 8 min read

Contents

Introduction

You know that feeling when you see something that makes you question everything you thought you knew about what's possible? That's exactly what happened when I watched Claude 4 build a fully functional Miro clone in just 5 minutes. Not a basic prototype. Not a "proof of concept." A legitimate whiteboarding app with sticky notes, drawing tools, shapes, and floating toolbars that actually work.

I'm not exaggerating when I say this changes everything about how we think about building software. Let me walk you through exactly how this happened and what it means for anyone who's ever had an app idea but thought they needed years of coding experience to make it real.

The Setup: From Idea to Product Requirements

Here's the thing about building with AI that most people get wrong - they jump straight into asking for code. That's like asking a contractor to build your house without showing them the blueprints. The magic happens in the planning phase.

I started by telling Claude exactly what I wanted: a Miro clone. But instead of asking it to start coding immediately, I had it create a Product Requirements Document (PRD) first. This is where we mapped out all the functionality:

  • Basic shapes (circles, rectangles, etc.)
  • Text tools for adding labels and notes
  • Drawing tools (pen, highlighter)
  • Sticky notes with customizable colors
  • Drag-and-drop functionality
  • Floating toolbars for editing

The PRD took about 3 minutes to create, and it became our roadmap for everything that followed. Think of it as having a conversation with Claude about what we're building before we actually build it.

The One-Prompt Challenge

Once we had our requirements locked down, I decided to push Claude 4 to its absolute limits. Instead of iterating back and forth, I uploaded the entire PRD and asked Claude to build the complete application in a single prompt.

This is where things got wild.

I switched to Claude 4 with extended thinking enabled (because why not go all out?), pasted in our requirements, and hit enter. What happened next was like watching a master craftsperson work - Claude didn't just write code, it architected an entire application from scratch.

The result? A working Miro clone that looked surprisingly professional. The UI was clean, the toolbar was intuitive, and when I started testing features, they actually worked. Sticky notes appeared where I clicked. The drawing tools responded to my mouse movements. The color picker changed element colors in real-time.

The Real-World Testing Phase

Of course, no first version is perfect. When I started really putting the app through its paces, I found some quirks. The floating toolbar was covering the sticky notes, making it impossible to type in them. There was an unnecessary color palette cluttering the interface.

But here's what blew my mind: fixing these issues was as simple as describing what was wrong. "Hey Claude, the toolbar is covering the sticky note, can you move it up?" Done. "Can you remove that color palette since we already have color options in the toolbar?" Fixed.

Each iteration took seconds, not hours. It was like having a developer sitting next to me who could implement changes faster than I could describe them. This kind of rapid iteration is exactly what makes AI-powered productivity tools so game-changing for creators and entrepreneurs.

When AI Hits Its Limits (And How to Work Around Them)

I'll be honest - I hit Claude's usage limits pretty quickly. Turns out, building complex applications burns through tokens fast, especially when you're using the most powerful models. But this actually taught me something important about working with AI tools.

Instead of getting frustrated, I adapted. I downloaded the code, created a new Claude account, and kept going. The lesson? When you're pushing the boundaries of what's possible, you need to be resourceful. The $20 monthly subscription suddenly felt like the bargain of the century when I realized I was getting development work that would normally cost thousands of dollars.

The Moment Everything Clicked

The real breakthrough came when I asked Claude to replicate Miro's shape editing toolbar - you know, that floating menu that appears when you select a shape, with options for changing colors, stroke width, and other properties.

I uploaded a screenshot of Miro's actual toolbar and asked Claude to recreate it. Not only did it build something that looked identical, but it actually worked. The color picker changed shape colors. The stroke width slider adjusted line thickness. Claude had reverse-engineered a complex UI component from a single image.

This is when I realized we're not just talking about AI that can write code. We're talking about AI that can understand design patterns, replicate user interfaces, and implement functionality based on visual examples. If you're curious about other ways AI can transform your creative workflow, check out my guide on AI tools for content creation.

What This Means for Everyone Else

Here's the part that gets me excited: this isn't just about building Miro clones. This is about democratizing software development in a way we've never seen before.

Think about all the times you've used an app and thought, "I wish this worked differently" or "I could build something better than this." With AI coding at this level, those thoughts aren't just wishful thinking anymore. They're legitimate possibilities.

You don't need to spend years learning programming languages. You don't need to understand databases or server architecture. You need to be able to describe what you want and iterate on the results.

The Bigger Picture

I want to be clear about something - I'm not trying to put Miro out of business. They've built an incredible product, and I'll probably keep using it. But what excites me is that we're entering an era where anyone can build custom tools that work exactly the way they want them to.

Maybe you need a project management tool that works differently than existing options. Maybe you want a note-taking app with specific features that don't exist anywhere else. Maybe you have an idea for something completely new.

With AI coding advancing this rapidly, the barrier between having an idea and having a working prototype has essentially disappeared. We're not talking about months or years of development time. We're talking about hours or days.

Getting Started with AI-Powered Development

If this has you thinking about your own projects, here's my advice: start with the requirements. Don't jump straight into asking for code. Spend time thinking through exactly what you want your application to do, how users will interact with it, and what the core features need to be.

Then, start simple. Build a basic version first, test it, and iterate. The beauty of working with AI is that changes are fast and cheap. You can experiment with different approaches without the traditional costs of software development.

Most importantly, don't be intimidated by the technical aspects. The whole point of AI for mortals is that you don't need to be a technical expert to build amazing things. You just need to be clear about what you want and willing to iterate until you get it right.

If you're ready to dive deeper into this world, I recommend starting with building your first AI workflow to get comfortable with the iterative process. And for those interested in seeing more examples of rapid AI development, my tutorial on building a full website with one AI prompt shows just how far we can push these tools.

The future of software development isn't about replacing human creativity - it's about amplifying it. And based on what I've seen with Claude 4, that future is already here.

About the Author

Pat Simmons
Pat Simmons
Author

Former ad man turned creative I became obsessed with AI after ChatGPT's release in 2022, and despite the very real fear of it replacing me as a creative, I haven't looked back since.

My mission with all my content is simple: turn your AI fear into excitement and show you how these tools can make your life more productive, more curious, and genuinely more fulfilling.

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