Replay AI: Building Accessible UI from Design Videos (2026)

TL;DR: Replay AI uses behavior-driven reconstruction to transform design videos into accessible, production-ready UI code, leveraging Gemini for intelligent interpretation and generation.

The Problem with Pixel-Perfect: Why Screenshots Fail in 2026#

The promise of AI-powered UI generation has always been tantalizing. But for years, the reality has fallen short. Early tools relied on static screenshots, leading to brittle, inflexible code that couldn't handle dynamic content or complex user interactions. We've all been there: spending hours tweaking generated code that was almost right, ultimately faster to build from scratch.

In 2026, accessibility isn't a nice-to-have; it's a requirement. And pixel-perfect, screenshot-based approaches simply can't capture the nuances of user behavior and intent necessary for truly accessible UI. They miss crucial context:

• •Dynamic content: A screenshot shows a single state, failing to account for loading states, error messages, or user-driven changes.
• •User interactions: Clicks, hovers, form submissions – these actions are invisible to screenshot analysis.
• •Accessibility considerations: Screen reader compatibility, keyboard navigation, and semantic HTML are often overlooked.

We need a new paradigm. A paradigm shift from static images to dynamic behavior.

Introducing Behavior-Driven Reconstruction with Replay AI#

Replay AI takes a fundamentally different approach. Instead of analyzing static images, Replay analyzes video. This allows us to capture the full spectrum of user behavior and intent, leading to more robust, accessible, and maintainable UI code.

Replay leverages Gemini's advanced video understanding capabilities to perform "Behavior-Driven Reconstruction." We treat the video as the source of truth, meticulously analyzing every interaction, animation, and state change. This allows us to generate code that accurately reflects the intended user experience, not just a visual snapshot.

💡 Pro Tip: Provide Replay with high-quality videos that clearly demonstrate all intended user flows and states for optimal code generation.

Replay's Key Features: Building Accessible UIs from Design Videos#

Replay AI offers a suite of features designed to streamline the UI development process and ensure accessibility:

• •Multi-page generation: Seamlessly generate code for entire websites or applications from a single video. Replay intelligently recognizes page transitions and maintains consistent styling across the project.
• •Supabase integration: Connect Replay to your Supabase project to automatically generate data-driven UI components. This eliminates the need for manual data binding and simplifies backend integration.
• •Style injection: Replay allows you to inject your existing CSS or Tailwind styles into the generated code, ensuring visual consistency with your brand.
• •Product Flow maps: Automatically generate visual diagrams of user flows based on the video analysis. This helps you understand how users interact with your application and identify potential usability issues.

Building a Simple To-Do App with Replay: A Step-by-Step Guide#

Let's walk through a practical example of using Replay to build a simple to-do app from a design video.

Step 1: Record the Design Video#

Create a short video (1-2 minutes) showcasing the intended functionality of your to-do app. This should include:

1. •Adding a new task.
2. •Marking a task as complete.
3. •Deleting a task.
4. •Handling empty states (e.g., no tasks).
5. •Any animations or transitions.

Ensure the video is clear, well-lit, and focuses on the UI elements.

Step 2: Upload the Video to Replay#

Log in to your Replay account and upload the design video. Replay will begin analyzing the video and reconstructing the UI.

Step 3: Review and Customize the Generated Code#

Once the analysis is complete, Replay will present you with the generated code. You can review the code, make adjustments, and customize the styling.

📝 Note: Replay uses semantic HTML elements and ARIA attributes to enhance accessibility. Review the generated code to ensure proper implementation.

Step 4: Integrate with Supabase (Optional)#

If you want to connect your to-do app to a Supabase database, you can configure the integration in Replay. Replay will automatically generate the necessary data models and API calls.

Step 5: Deploy Your App#

Once you're satisfied with the code, you can deploy your app to your preferred hosting platform.

Code Example: Generated To-Do Item Component#

Here's an example of a generated to-do item component using React and Tailwind CSS:

typescript
// Generated by Replay AI
import React from 'react';

interface TodoItemProps {
  id: string;
  text: string;
  completed: boolean;
  onToggle: (id: string) => void;
  onDelete: (id: string) => void;
}

const TodoItem: React.FC<TodoItemProps> = ({ id, text, completed, onToggle, onDelete }) => {
  return (
    <li className="flex items-center justify-between py-2 border-b border-gray-200">
      <div className="flex items-center">
        <input
          type="checkbox"
          id={`todo-${id}`}
          checked={completed}
          onChange={() => onToggle(id)}
          className="mr-2 h-5 w-5 text-blue-600 focus:ring-blue-500 border-gray-300 rounded"
        />
        <label htmlFor={`todo-${id}`} className={`text-gray-700 ${completed ? 'line-through' : ''}`}>
          {text}
        </label>
      </div>
      <button onClick={() => onDelete(id)} className="text-red-500 hover:text-red-700 focus:outline-none">
        <svg xmlns="http://www.w3.org/2000/svg" className="h-5 w-5" viewBox="0 0 20 20" fill="currentColor">
          <path fillRule="evenodd" d="M9 2a1 1 0 00-.894.553L7.382 4H4a1 1 0 000 2v10a2 2 0 002 2h8a2 2 0 002-2V6a1 1 0 100-2h-3.382l-.724-1.447A1 1 0 0011 2H9zM7 8a1 1 0 012 0v6a1 1 0 11-2 0V8zm5-1a1 1 0 00-1 1v6a1 1 0 102 0V8a1 1 0 00-1-1z" clipRule="evenodd" />
        </svg>
      </button>
    </li>
  );
};

export default TodoItem;

This code is not just a visual representation of the to-do item; it includes:

• •Semantic HTML: Uses
  text

  <li>
  ,
  text

  <label>
  , and
  text

  <input>
  elements for proper structure.
• •Accessibility attributes: Includes
  text

  id
  and
  text

  htmlFor
  attributes for associating labels with checkboxes.
• •Event handlers: Provides
  text

  onToggle
  and
  text

  onDelete
  props for handling user interactions.

⚠️ Warning: Always test your generated UI with assistive technologies like screen readers to ensure full accessibility.

Beyond the Basics: Advanced Use Cases#

Replay AI isn't just for simple to-do apps. It can be used to generate complex UIs for a wide range of applications:

• •E-commerce websites: Generate product listings, shopping carts, and checkout flows.
• •Dashboard applications: Create interactive dashboards with charts, graphs, and data tables.
• •Mobile apps: Generate native or cross-platform mobile UIs.

Replay's ability to understand user behavior and intent makes it a powerful tool for building accessible and engaging user experiences.

Frequently Asked Questions#

Is Replay free to use?#

Replay offers a free tier with limited features. Paid plans are available for more advanced functionality and higher usage limits. Check the Replay pricing page for details.

How is Replay different from v0.dev?#

While both tools aim to generate UI code from AI, Replay focuses on behavior-driven reconstruction from videos, while v0.dev typically uses text prompts and potentially screenshots. Replay excels at capturing dynamic behavior and complex interactions that are missed by screenshot-based approaches. Replay also offers features like Supabase integration and product flow maps, further streamlining the development process.

What file formats are supported for video uploads?#

Replay supports common video formats such as MP4, MOV, and AVI.

What frameworks are supported?#

Replay currently supports React and Vue.js, with support for Angular and other frameworks planned for future releases.

How does Replay handle accessibility?#

Replay uses semantic HTML elements, ARIA attributes, and keyboard navigation to enhance accessibility. We also provide tools for reviewing and customizing the generated code to ensure compliance with accessibility standards.

---

Ready to try behavior-driven code generation? Get started with Replay - transform any video into working code in seconds.