Replay AI: How to Turn Video into Production-Quality Mobile UIs in Minutes

TL;DR: Replay AI uses video analysis to reconstruct production-ready mobile UIs, understanding user behavior to generate accurate and functional code, unlike traditional screenshot-to-code tools.

The dream of effortlessly converting design concepts into tangible, working code is closer than ever. But current "AI" solutions often fall short, generating brittle code that requires extensive manual rework. The problem? They treat the UI as a static image, missing the crucial context of how the user interacts with it.

Enter Replay. We're not just another screenshot-to-code tool. We analyze video recordings of user flows, leveraging the power of Gemini to understand user intent and reconstruct UI elements with unprecedented accuracy. This "Behavior-Driven Reconstruction" approach results in production-quality mobile UIs that are ready to deploy, saving you countless hours of manual coding.

Understanding Behavior-Driven Reconstruction#

Traditional screenshot-to-code solutions treat your design as a static snapshot. They can identify UI elements, but they lack the crucial context of user interaction. This leads to incomplete or incorrect code generation.

Replay takes a fundamentally different approach. By analyzing video recordings, we capture the dynamic nature of user behavior. We understand the sequence of actions, the transitions between screens, and the overall flow of the application. This allows us to generate code that accurately reflects the intended user experience.

The Power of Video Analysis#

Video provides a wealth of information that static images simply can't capture:

• •Gestures and Interactions: Taps, swipes, scrolls – Replay understands how users interact with the UI.
• •Transitions and Animations: Smooth animations and screen transitions are captured and accurately reproduced in code.
• •Dynamic Content: Replay can track changes in content based on user actions, ensuring the generated UI is dynamic and responsive.

This deeper understanding of user behavior is what sets Replay apart and enables us to generate production-ready mobile UIs.

Replay Features: From Video to Working Code#

Replay offers a comprehensive suite of features designed to streamline the UI development process:

• •Multi-Page Generation: Reconstruct entire application flows from a single video recording.
• •Supabase Integration: Seamlessly integrate with your Supabase backend for data persistence and real-time updates.
• •Style Injection: Customize the look and feel of your UI with CSS or Tailwind CSS.
• •Product Flow Maps: Visualize the user flow captured in the video recording, providing a clear overview of the application's structure.

Here's a comparison of Replay against other popular code generation tools:

Building a Mobile UI with Replay: A Step-by-Step Guide#

Let's walk through the process of using Replay to generate a mobile UI from a video recording. For this example, we'll assume you have a video of a simple to-do list application.

Step 1: Prepare Your Video Recording#

💡 Pro Tip: Ensure your video recording is clear and stable. Use a screen recording tool that captures high-quality video. Avoid excessive background noise or distractions.

Before uploading, ensure your video clearly demonstrates the intended user flow. This includes adding tasks, marking them as complete, and deleting them.

Step 2: Upload to Replay#

Navigate to the Replay platform and upload your video recording. Replay will automatically begin analyzing the video and identifying UI elements.

Step 3: Configure Replay Settings#

Configure the settings according to your needs:

• •Framework: Choose your target framework (e.g., React Native, Flutter).
• •Styling: Select your preferred styling method (CSS, Tailwind CSS).
• •Supabase: Configure your Supabase connection if you want to integrate with your backend.

Step 4: Review and Edit the Generated Code#

Replay will generate code based on the video analysis. Review the generated code and make any necessary adjustments.

📝 Note: While Replay strives for perfection, some manual adjustments may be required, especially for complex UIs.

Here's an example of code Replay might generate for a simple to-do list item:

typescript
// React Native example
import React from 'react';
import { View, Text, StyleSheet, TouchableOpacity } from 'react-native';

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

const TodoItem: React.FC<TodoItemProps> = ({ text, completed, onToggle, onDelete }) => {
  return (
    <View style={styles.item}>
      <TouchableOpacity style={styles.checkbox} onPress={onToggle}>
        {completed && <View style={styles.checkboxInner} />}
      </TouchableOpacity>
      <Text style={[styles.text, completed && styles.textCompleted]}>{text}</Text>
      <TouchableOpacity style={styles.deleteButton} onPress={onDelete}>
        <Text style={styles.deleteButtonText}>X</Text>
      </TouchableOpacity>
    </View>
  );
};

const styles = StyleSheet.create({
  item: {
    flexDirection: 'row',
    alignItems: 'center',
    padding: 10,
    borderBottomWidth: 1,
    borderBottomColor: '#eee',
  },
  checkbox: {
    width: 20,
    height: 20,
    borderWidth: 1,
    borderColor: '#ccc',
    borderRadius: 10,
    marginRight: 10,
    justifyContent: 'center',
    alignItems: 'center',
  },
  checkboxInner: {
    width: 12,
    height: 12,
    borderRadius: 6,
    backgroundColor: 'green',
  },
  text: {
    fontSize: 16,
    flex: 1,
  },
  textCompleted: {
    textDecorationLine: 'line-through',
    color: '#aaa',
  },
  deleteButton: {
    padding: 5,
  },
  deleteButtonText: {
    color: 'red',
    fontWeight: 'bold',
  },
});

export default TodoItem;

Step 5: Integrate with Your Project#

Download the generated code and integrate it into your mobile application project. Connect the UI elements to your backend data sources and implement any necessary business logic.

Step 6: Test and Deploy#

Thoroughly test your application to ensure it functions as expected. Deploy your application to the app store or distribute it to your users.

Benefits of Using Replay#

• •Accelerated Development: Drastically reduce the time and effort required to build mobile UIs.
• •Improved Accuracy: Generate code that accurately reflects the intended user experience.
• •Reduced Rework: Minimize the need for manual code adjustments.
• •Enhanced Collaboration: Facilitate collaboration between designers and developers.
• •Focus on Functionality: Spend more time on core functionality and less time on tedious UI coding.

Advanced Features and Customization#

Replay offers a range of advanced features and customization options to tailor the code generation process to your specific needs.

Style Injection with Tailwind CSS#

Replay supports style injection using Tailwind CSS. This allows you to easily customize the look and feel of your UI by applying Tailwind classes to the generated elements.

typescript
// Example of using Tailwind CSS with Replay
import React from 'react';

const Button = () => {
  return (
    <button className="bg-blue-500 hover:bg-blue-700 text-white font-bold py-2 px-4 rounded">
      Click me
    </button>
  );
};

export default Button;

Supabase Integration for Real-Time Data#

Seamlessly integrate with your Supabase backend to enable real-time data updates and persistence. Replay can automatically generate the necessary code to connect your UI elements to your Supabase database.

⚠️ Warning: Ensure you have properly configured your Supabase project and have the necessary credentials before enabling Supabase integration in Replay.

Product Flow Maps for Visualizing User Journeys#

Replay generates a visual product flow map from the video. This allows you to quickly understand the user journey and identify potential areas for improvement.

Frequently Asked Questions#

Is Replay free to use?#

Replay offers a free tier with limited features. Paid plans are available for more advanced features and higher usage limits.

How is Replay different from v0.dev?#

While both aim to generate code, Replay focuses on behavior-driven reconstruction from video, understanding user interaction. v0.dev primarily uses text prompts and generates code based on descriptions, which can often be less accurate and require more manual adjustments. Replay aims for production-ready code from the start.

What frameworks does Replay support?#

Currently, Replay supports React Native and Flutter, with plans to add support for other popular frameworks in the future.

What types of videos work best with Replay?#

Clear, stable screen recordings with minimal background noise work best. Ensure the video clearly demonstrates the intended user flow.

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