Replay AI: How Developers are using UI Video to generate Code Automatically (2026)

TL;DR: Replay AI revolutionizes code generation by analyzing UI videos, enabling developers to automatically reconstruct functional UIs with behavior-driven insights.

The Dawn of Behavior-Driven Code: Replay AI in 2026#

The way we build UIs is fundamentally changing. Forget static mockups and endless design iterations. In 2026, the most innovative teams are leveraging video as the source of truth, using tools like Replay AI to automatically generate code that mirrors real user interactions. This isn't just screenshot-to-code; it's behavior-driven reconstruction.

Traditional methods of UI development are often plagued by miscommunication between designers and developers. Designs get lost in translation, and subtle nuances of user interaction are overlooked. This leads to frustrating rework, delayed timelines, and ultimately, a subpar user experience. Replay offers a solution by directly interpreting user behavior from video, ensuring that the final code accurately reflects the intended interaction.

How Replay AI Works: Video as the Blueprint#

Replay AI uses advanced video analysis and Gemini's powerful AI capabilities to understand not just what the user sees, but what they are trying to do. This "Behavior-Driven Reconstruction" is the key differentiator.

Here's a simplified overview of the process:

1. •Video Capture: A screen recording captures a user interacting with an existing UI or a prototype. This video becomes the input for Replay.
2. •Behavioral Analysis: Replay analyzes the video frame-by-frame, identifying UI elements, user actions (clicks, scrolls, form inputs), and navigation patterns.
3. •Code Generation: Based on the behavioral analysis, Replay generates clean, functional code in your preferred framework (React, Vue, etc.).
4. •Integration & Customization: The generated code can be easily integrated into your existing project and customized to fit your specific needs.

Key Features of Replay AI#

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

• •Multi-page Generation: Replay can analyze videos spanning multiple pages or views, generating complete user flows.
• •Supabase Integration: Seamlessly integrate your generated UI with Supabase for backend functionality and data management.
• •Style Injection: Replay intelligently infers and applies styles based on the video, ensuring a visually consistent UI.
• •Product Flow Maps: Visualize user journeys and identify potential bottlenecks with automatically generated product flow maps.

Replay AI in Action: A Practical Example#

Let's say you have a video of a user navigating a simple e-commerce checkout flow. The user adds an item to their cart, enters their shipping information, and completes the purchase. Here's how you can use Replay to generate the UI code:

Step 1: Upload the Video to Replay#

Simply upload the screen recording to the Replay platform.

Step 2: Analyze the Video#

Replay will automatically analyze the video and identify the key UI elements and user actions. This process typically takes a few minutes, depending on the length of the video.

Step 3: Generate the Code#

Once the analysis is complete, Replay will generate the code for the checkout flow. You can choose your preferred framework (e.g., React) and customize the output settings.

Step 4: Integrate and Customize#

Copy the generated code into your project and customize it as needed.

Here's an example of the React code that Replay might generate for the shipping information form:

typescript
// Generated by Replay AI
import React, { useState } from 'react';

const ShippingForm = () => {
  const [name, setName] = useState('');
  const [address, setAddress] = useState('');
  const [city, setCity] = useState('');
  const [zip, setZip] = useState('');

  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault();
    // Handle form submission logic here
    console.log('Shipping Information:', { name, address, city, zip });
  };

  return (
    <form onSubmit={handleSubmit}>
      <div>
        <label htmlFor="name">Name:</label>
        <input type="text" id="name" value={name} onChange={(e) => setName(e.target.value)} />
      </div>
      <div>
        <label htmlFor="address">Address:</label>
        <input type="text" id="address" value={address} onChange={(e) => setAddress(e.target.value)} />
      </div>
      <div>
        <label htmlFor="city">City:</label>
        <input type="text" id="city" value={city} onChange={(e) => setCity(e.target.value)} />
      </div>
      <div>
        <label htmlFor="zip">Zip Code:</label>
        <input type="text" id="zip" value={zip} onChange={(e) => setZip(e.target.value)} />
      </div>
      <button type="submit">Submit</button>
    </form>
  );
};

export default ShippingForm;

This is a basic example, but Replay can handle more complex UI interactions and generate code for entire user flows.

💡 Pro Tip: For optimal results, ensure your screen recordings are clear, well-lit, and free of distractions.

Replay AI vs. Traditional Methods and Other Tools#

How does Replay compare to traditional UI development methods and other code generation tools?

📝 Note: Screenshot-to-code tools are useful for generating basic UI elements, but they often struggle with complex interactions and dynamic content. Replay excels in these areas due to its behavior-driven approach.

Benefits of Using Replay AI#

• •Faster Development Cycles: Automate the code generation process and reduce the time it takes to build UIs.
• •Improved Accuracy: Ensure that the generated code accurately reflects the intended user experience.
• •Reduced Rework: Minimize miscommunication between designers and developers and reduce the need for rework.
• •Enhanced Collaboration: Facilitate collaboration between designers and developers by providing a shared understanding of user behavior.
• •Better User Experience: Create UIs that are intuitive and easy to use.

⚠️ Warning: While Replay can generate a significant amount of code automatically, it's important to review and customize the output to ensure it meets your specific requirements.

The Future of UI Development#

Replay AI represents a significant step forward in the evolution of UI development. By leveraging the power of video analysis and AI, developers can automate the code generation process, improve accuracy, and create better user experiences. As AI technology continues to advance, we can expect to see even more innovative tools emerge that further streamline the UI development workflow.

Frequently Asked Questions#

Is Replay free to use?#

Replay offers a free trial with limited features. Paid plans are available for users who require more advanced functionality and higher usage limits.

How is Replay different from v0.dev?#

While both tools aim to accelerate UI development, Replay distinguishes itself by using video as the primary input and focusing on behavior-driven reconstruction. V0.dev relies on text prompts and AI to generate UI components, while Replay analyzes real user interactions to create more accurate and context-aware code.

What frameworks does Replay support?#

Replay currently supports React, Vue, and Angular. Support for other frameworks is planned for future releases.

Can Replay handle complex animations and transitions?#

Replay can analyze and generate code for basic animations and transitions. More complex animations may require manual customization.

How secure is Replay?#

Replay uses industry-standard security measures to protect your data. All video uploads and code generation processes are encrypted.

---

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