Replay AI for Creating Web UI with user Authentication from video

TL;DR: Replay AI reconstructs fully functional web UIs with user authentication directly from video recordings, enabling rapid prototyping and development.

Replay AI: From Video to Authenticated Web UI in Minutes#

The traditional UI development process is often slow and iterative. Translating design concepts and user flows into working code requires significant time and effort. What if you could bypass much of the manual coding by simply recording a video of the desired user experience?

Replay AI makes this a reality. Unlike traditional screenshot-to-code tools, Replay analyzes video – the behavior within the video – to reconstruct fully functional web UIs. This includes complex features like user authentication, multi-page flows, and dynamic data integration. This approach, which we call "Behavior-Driven Reconstruction," treats the video as the source of truth, capturing not just the visual appearance but also the intent behind user actions.

Understanding Behavior-Driven Reconstruction#

Traditional UI generation tools rely on static images, which lack crucial information about user interactions and application logic. Replay, however, utilizes Gemini to analyze video, interpreting user behavior and translating it into executable code. This allows Replay to understand:

• •Click events and their associated actions
• •Data input and validation processes
• •Navigation between pages
• •Authentication flows
• •Dynamic content updates

This understanding enables Replay to generate not just a static UI, but a dynamic and interactive application.

Building an Authenticated UI with Replay: A Step-by-Step Guide#

Let's walk through the process of creating a web UI with user authentication using Replay. We'll assume you have a video recording of a user interacting with a prototype or existing application, demonstrating the login, registration, and profile management functionalities.

Step 1: Preparing Your Video#

Ensure your video clearly showcases the desired user authentication flow. This includes:

• •Registration process (entering email, password, etc.)
• •Login process
• •Password reset flow (optional)
• •Profile management (updating user information)

The clearer the video, the better Replay can understand and reconstruct the UI.

Step 2: Uploading and Processing with Replay#

Upload your video to the Replay platform. Replay will automatically analyze the video and generate a code preview. This process leverages Gemini to understand the user interactions and reconstruct the UI elements and their associated behaviors.

Step 3: Configuring Authentication with Supabase#

Replay seamlessly integrates with Supabase for backend services, including user authentication. During the code generation process, you can configure Replay to use Supabase for handling user registration, login, and session management.

💡 Pro Tip: Ensure you have a Supabase project set up with authentication enabled before proceeding.

Step 4: Reviewing and Customizing the Generated Code#

Replay generates clean, well-structured code that you can review and customize. This code includes:

• •UI components (HTML, CSS, JavaScript/TypeScript)
• •Authentication logic (Supabase integration)
• •API endpoints for interacting with Supabase

Here's an example of the generated code for a login form:

typescript
// src/components/LoginForm.tsx
import { useState } from 'react';
import { supabase } from '../supabaseClient';

const LoginForm = () => {
  const [email, setEmail] = useState('');
  const [password, setPassword] = useState('');
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);

  const handleLogin = async (e: React.FormEvent) => {
    e.preventDefault();
    setLoading(true);
    setError(null);

    try {
      const { error } = await supabase.auth.signInWithPassword({
        email: email,
        password: password,
      });

      if (error) {
        setError(error.message);
      }
    } catch (err: any) {
      setError(err.message);
    } finally {
      setLoading(false);
    }
  };

  return (
    <form onSubmit={handleLogin}>
      {error && <div className="error">{error}</div>}
      <div>
        <label htmlFor="email">Email:</label>
        <input
          type="email"
          id="email"
          value={email}
          onChange={(e) => setEmail(e.target.value)}
          required
        />
      </div>
      <div>
        <label htmlFor="password">Password:</label>
        <input
          type="password"
          id="password"
          value={password}
          onChange={(e) => setPassword(e.target.value)}
          required
        />
      </div>
      <button type="submit" disabled={loading}>
        {loading ? 'Logging in...' : 'Login'}
      </button>
    </form>
  );
};

export default LoginForm;

This code snippet demonstrates how Replay integrates with Supabase for user authentication. The

function calls to authenticate the user.

Step 5: Deploying Your Authenticated UI#

Once you're satisfied with the generated code, you can deploy it to your preferred hosting platform (e.g., Vercel, Netlify). The generated code is ready to run, with all the necessary dependencies and configurations.

Key Features of Replay for Authentication#

Replay offers several key features that make building authenticated UIs easier and faster:

• •Multi-page Generation: Replay can generate entire multi-page applications from a single video, including navigation and data flow between pages.
• •Supabase Integration: Seamless integration with Supabase simplifies backend development and user authentication.
• •Style Injection: Replay can inject custom styles into the generated UI, allowing you to quickly customize the look and feel of your application.
• •Product Flow Maps: Replay automatically generates product flow maps, visualizing the user journey through your application.

Replay vs. Traditional UI Development Tools#

📝 Note: Replay is not a replacement for skilled developers. It's a powerful tool that accelerates the development process and allows developers to focus on more complex tasks.

Benefits of Using Replay for UI Development#

• •Accelerated Development: Replay significantly reduces the time required to build UIs, allowing you to rapidly prototype and iterate on your designs.
• •Improved Accuracy: By analyzing video, Replay captures the intended user behavior more accurately than traditional methods.
• •Reduced Errors: The generated code is clean and well-structured, reducing the risk of errors and bugs.
• •Enhanced Collaboration: Replay makes it easier for designers and developers to collaborate, as they can simply record a video of the desired UI and let Replay generate the code.
• •Focus on Logic: By automating the UI generation process, developers can focus on the more complex aspects of their applications, such as business logic and data integration.

⚠️ Warning: While Replay significantly accelerates UI development, it's crucial to review and customize the generated code to ensure it meets your specific requirements.

Frequently Asked Questions#

Is Replay free to use?#

Replay offers a free tier with limited features and usage. Paid plans are available for more advanced features and higher usage limits. Check the pricing page on the Replay website for the most up-to-date information.

How is Replay different from v0.dev?#

While both Replay and v0.dev aim to simplify UI development, they take different approaches. v0.dev primarily uses text prompts to generate UI components, while Replay analyzes video recordings of user interactions to reconstruct entire applications. Replay's "Behavior-Driven Reconstruction" allows it to capture the intent behind user actions, resulting in more accurate and functional UIs. Replay also focuses on generating complete applications with backend integrations (like Supabase) rather than just individual components.

What kind of videos work best with Replay?#

Videos that clearly demonstrate the desired user flow and UI interactions work best. Ensure the video is well-lit and the UI elements are clearly visible. It's also helpful to narrate the video, explaining the purpose of each action.

What technologies does Replay support?#

Replay currently supports React and TypeScript for the generated code. Support for other technologies is planned for future releases. Replay's backend integration primarily focuses on Supabase, but can be extended to other backend services through custom API integrations.

Can I customize the generated code?#

Yes, the generated code is fully customizable. You can modify the UI components, authentication logic, and API endpoints to meet your specific requirements. Replay provides a solid foundation, but it's up to you to refine and extend the code as needed.

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