Replay AI: The Step-by-Step Guide to Building UIs from Video in 2026

TL;DR: Replay AI reconstructs functional UIs directly from video recordings, leveraging behavior-driven reconstruction to understand user intent and generate code, saving significant development time.

Building UIs from Video: A 2026 Reality with Replay AI#

The future of UI development is here, and it's powered by video. Imagine capturing a user flow, a product demo, or even a competitor's application and instantly transforming it into working code. This isn't science fiction; it's the promise of behavior-driven reconstruction, and Replay AI is leading the charge. This guide will walk you through how Replay works and how you can use it to accelerate your development process.

Gone are the days of painstakingly recreating UIs from static screenshots or design mockups. Replay understands the intent behind the user's actions, not just the visual elements on the screen. This approach unlocks a new level of efficiency and accuracy in UI development.

Understanding Behavior-Driven Reconstruction#

Traditional screenshot-to-code tools focus solely on visual elements. They convert images into HTML and CSS, often resulting in brittle and inflexible code. Replay takes a different approach. It analyzes video recordings to understand the user's behavior, the flow of interactions, and the underlying logic. This "behavior-driven reconstruction" allows Replay to generate more robust, maintainable, and functional code.

Key Features of Replay AI#

Replay offers a range of powerful features designed to streamline UI development:

• •Multi-Page Generation: Reconstruct entire user flows, not just single screens.
• •Supabase Integration: Seamlessly connect your UI to a Supabase backend for data management.
• •Style Injection: Customize the look and feel of your generated UI with ease.
• •Product Flow Maps: Visualize and understand the user journey through your application.
• •Video as Source of Truth: Ensures that the generated code accurately reflects the intended user experience.

Step-by-Step Guide to Building UIs with Replay AI#

Here's a practical guide to using Replay to generate UIs from video recordings:

Step 1: Capture the Video#

The first step is to record the user flow or UI that you want to reconstruct. This could be a recording of:

• •A user interacting with an existing application.
• •A product demo showcasing a new feature.
• •A competitor's application that you want to emulate.

💡 Pro Tip: Ensure the video is clear and captures all relevant user interactions. The better the video quality, the more accurate the reconstruction will be.

Step 2: Upload and Analyze with Replay#

Upload the video to the Replay platform. Replay's AI engine will automatically analyze the video, identifying UI elements, user interactions, and the overall flow of the application.

Step 3: Review and Refine#

Once the analysis is complete, review the generated UI in the Replay editor. You can make adjustments to the code, customize styles, and connect to your backend data sources.

📝 Note: Replay provides a visual editor that allows you to easily modify the generated code. This ensures that you have full control over the final output.

Step 4: Integrate with Your Project#

Download the generated code and integrate it into your existing project. Replay supports a variety of frameworks and technologies, making it easy to incorporate the generated UI into your application.

Example: Reconstructing a Simple To-Do List App#

Let's say you have a video recording of a user interacting with a simple to-do list application. The user adds tasks, marks them as complete, and deletes them. Replay can analyze this video and generate the following code:

typescript
// React component for a to-do list item
import React, { useState } from 'react';

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

const TodoItem: React.FC<TodoItemProps> = ({ text, completed, onToggle, onDelete }) => {
  return (
    <li>
      <input type="checkbox" checked={completed} onChange={onToggle} />
      <span style={{ textDecoration: completed ? 'line-through' : 'none' }}>{text}</span>
      <button onClick={onDelete}>Delete</button>
    </li>
  );
};

export default TodoItem;

This is a simplified example, but it demonstrates how Replay can generate functional React components directly from a video recording.

Integrating with Supabase#

Replay seamlessly integrates with Supabase, allowing you to connect your generated UI to a powerful backend data source. Here's how you can integrate Replay with Supabase:

1. •Create a Supabase project: If you don't already have one, create a new Supabase project.
2. •Configure Replay: In the Replay editor, configure the Supabase integration by providing your Supabase project URL and API key.
3. •Map UI elements to Supabase data: Use the Replay editor to map UI elements to your Supabase database tables. This allows Replay to automatically generate code that fetches and updates data from your Supabase backend.

typescript
// Example: Fetching to-do items from Supabase
import { createClient } from '@supabase/supabase-js';

const supabaseUrl = 'YOUR_SUPABASE_URL';
const supabaseKey = 'YOUR_SUPABASE_API_KEY';
const supabase = createClient(supabaseUrl, supabaseKey);

const fetchTodos = async () => {
  const { data, error } = await supabase
    .from('todos')
    .select('*');

  if (error) {
    console.error('Error fetching todos:', error);
    return [];
  }

  return data;
};

⚠️ Warning: Always protect your Supabase API key and project URL. Do not expose them in client-side code. Use environment variables or server-side functions to securely manage your Supabase credentials.

Benefits of Using Replay AI#

• •Accelerated Development: Generate UIs in minutes instead of hours.
• •Improved Accuracy: Reconstruct UIs with pixel-perfect precision.
• •Enhanced Collaboration: Share video recordings with your team and collaborate on UI development.
• •Reduced Costs: Save time and resources by automating UI reconstruction.
• •Increased Productivity: Focus on higher-level tasks instead of repetitive coding.
• •Rapid Prototyping: Quickly create prototypes from existing applications or user flows.

Frequently Asked Questions#

Is Replay free to use?#

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

How is Replay different from v0.dev?#

While both Replay and v0.dev aim to accelerate UI development, they differ significantly in their approach. V0.dev primarily uses text prompts to generate UI components, while Replay analyzes video recordings to understand user behavior and reconstruct entire UIs. Replay focuses on replicating existing UIs accurately, whereas v0.dev emphasizes generating new UIs from scratch.

What types of videos can Replay analyze?#

Replay can analyze a wide range of video recordings, including screen recordings, product demos, user flow videos, and even recordings of competitor applications. The key is to ensure that the video is clear and captures all relevant user interactions.

What frameworks and technologies does Replay support?#

Replay supports a variety of popular frameworks and technologies, including React, Vue.js, Angular, and more. It also integrates seamlessly with backend platforms like Supabase and Firebase.

How accurate is Replay's UI reconstruction?#

Replay's UI reconstruction is highly accurate, thanks to its behavior-driven approach. By analyzing user interactions and understanding the underlying logic, Replay can generate code that closely matches the original UI. However, the accuracy can be affected by the quality of the video recording.

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