Replay AI: The Fastest Way to Build UI from Video (2026)

TL;DR: Replay AI is revolutionizing UI development by using video analysis to automatically generate working code, understanding user behavior and intent beyond simple screenshot conversions.

Replay AI: The Fastest Way to Build UI from Video (2026)#

The future of UI development isn't just about pixels; it's about behavior. We've all been there: staring at a screen recording, trying to reverse-engineer a complex user flow, painstakingly translating visual actions into lines of code. The traditional approach is slow, error-prone, and frankly, a massive time sink. But what if you could simply show the machine what you want and have it generate the code for you? That's the promise of Replay AI.

Replay isn't just another screenshot-to-code tool. It's a video-to-code engine that leverages the power of Gemini to reconstruct working UI from screen recordings. It's a paradigm shift from pixel-perfect replication to behavior-driven reconstruction.

The Problem with Traditional UI Development#

Traditional UI development often relies on manual coding, mockups, and static design tools. This process is time-consuming and prone to errors. Even "AI" powered tools relying on screenshots fall short. They can only interpret what's visible, not why the user is interacting with the interface in a specific way.

Consider the following scenario: you're onboarding new users to a complex SaaS platform. You've recorded a video showcasing the ideal user flow. With traditional methods, you'd spend hours manually translating that video into code. With screenshot-to-code tools, you might get a static representation, but you'd still need to add the logic and interactivity.

Replay changes the game. It understands the intent behind each click, scroll, and form submission, and translates that intent into functional code.

Behavior-Driven Reconstruction: The Replay Difference#

The core innovation behind Replay is its "Behavior-Driven Reconstruction" engine. This means that Replay analyzes the entire video, not just individual frames. It understands the sequence of actions, the context of each interaction, and the overall goal of the user. This allows Replay to generate code that accurately reflects the intended functionality.

Key Features that Set Replay Apart#

• •Multi-page Generation: Replay can analyze videos that span multiple pages or screens, automatically generating the corresponding code for each page.
• •Supabase Integration: Seamlessly integrate your Replay-generated UI with Supabase for backend functionality.
• •Style Injection: Customize the look and feel of your UI by injecting custom CSS styles.
• •Product Flow Maps: Visualize the user flow captured in the video, providing a clear overview of the application's functionality.

Let's compare Replay to other popular UI generation tools:

As you can see, Replay offers a unique set of features that address the limitations of traditional UI development tools.

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

Let's walk through a practical example of using Replay to build a simple UI from a video recording. In this example, we'll create a basic to-do list application.

Step 1: Record Your User Flow#

First, record a video of yourself interacting with a to-do list application (either a real one or a mockup). Make sure to demonstrate the key features, such as adding new tasks, marking tasks as complete, and deleting tasks.

📝 Note: The clearer and more deliberate your actions in the video, the better Replay will be able to understand your intent.

Step 2: Upload Your Video to Replay#

Next, upload your video to the Replay platform. Replay will automatically analyze the video and generate a preliminary UI structure.

Step 3: Refine and Customize Your Code#

Once Replay has generated the initial code, you can refine and customize it to meet your specific needs. You can adjust the styling, add new features, and integrate with your backend services.

Here's an example of the kind of code Replay might generate for adding a new task to the to-do list:

typescript
// Example Replay-generated code for adding a task
const addTask = async (taskName: string) => {
  const newTask = {
    name: taskName,
    completed: false,
  };

  try {
    const response = await fetch('/api/todos', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify(newTask),
    });

    if (response.ok) {
      // Update the UI with the new task
      console.log("Task added successfully!");
    } else {
      console.error("Failed to add task:", response.status);
    }
  } catch (error) {
    console.error("Error adding task:", error);
  }
};

💡 Pro Tip: Use descriptive variable names and comments to make your code more readable and maintainable. Replay's generated code is a great starting point, but you'll likely want to add your own touches.

Step 4: Integrate with Supabase (Optional)#

If you're using Supabase as your backend, you can easily integrate your Replay-generated UI with your Supabase database. Replay provides built-in support for Supabase, making it easy to fetch and update data.

The Benefits of Using Replay AI#

Using Replay AI offers a number of significant benefits:

• •Faster Development: Generate working UI code in seconds, significantly reducing development time.
• •Improved Accuracy: Behavior-driven reconstruction ensures that the generated code accurately reflects the intended functionality.
• •Reduced Errors: Automate the process of translating visual actions into code, minimizing the risk of human error.
• •Enhanced Collaboration: Easily share video recordings and generated code with your team, facilitating collaboration and knowledge sharing.
• •Increased Productivity: Focus on higher-level tasks, such as designing user experiences and implementing complex business logic.

⚠️ Warning: While Replay can significantly accelerate UI development, it's important to remember that it's a tool, not a replacement for skilled developers. You'll still need to review and refine the generated code to ensure that it meets your specific requirements.

Real-World Use Cases#

Replay can be used in a wide range of real-world scenarios:

• •Rapid Prototyping: Quickly create prototypes of new UI designs by simply recording a video of yourself interacting with a mockup.
• •Legacy System Modernization: Generate code for modernizing legacy systems by recording videos of users interacting with the existing interface.
• •User Onboarding: Create interactive tutorials and onboarding flows by recording videos of yourself demonstrating how to use your application.
• •A/B Testing: Quickly create variations of your UI for A/B testing by recording videos of yourself interacting with different designs.

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 require more advanced features and higher usage limits. Check the Replay website for the most up-to-date pricing information.

How is Replay different from v0.dev?#

While both Replay and v0.dev aim to accelerate UI development, they take different approaches. V0.dev relies on text prompts to generate code, while Replay analyzes video recordings to understand user behavior and intent. Replay's behavior-driven approach allows it to generate more accurate and functional code, especially for complex user flows. Replay also focuses on understanding the UI from video, not just generating it from scratch. This opens up possibilities for reverse engineering and understanding existing UIs.

What types of videos work best with Replay?#

Videos with clear and deliberate user actions tend to produce the best results. Make sure to record your videos in a well-lit environment with minimal background noise. Also, ensure that the UI elements in the video are clearly visible and distinguishable.

What code frameworks does Replay support?#

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

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