Replay AI: Building Internationalized UI from Design Videos (2026)

TL;DR: Replay AI revolutionizes internationalized UI development by generating functional code directly from design videos, eliminating manual translation and ensuring consistent user experiences across languages.

The future of UI development isn't about static mockups or endless design iterations. It's about capturing user behavior and translating it directly into functional, internationalized code. The problem? Current tools rely on screenshots and manual translations, resulting in inconsistent experiences and wasted developer time.

The Broken Promise of Screenshot-to-Code#

Screenshot-to-code tools promised to streamline UI development, but they fall short when dealing with dynamic user interfaces and, crucially, internationalization. They capture a single visual state, failing to understand the underlying logic and user intent. This approach simply cannot account for variations in text length across languages, dynamic content updates, or complex user flows.

Behavior-Driven Reconstruction: The Replay Difference#

Replay takes a radically different approach. Instead of relying on static images, Replay analyzes video recordings of user interactions. This allows Replay to understand:

• •User Flows: How users navigate through the application.
• •Dynamic Content: How the UI responds to user actions.
• •Underlying Logic: The intent behind each interaction.

This "Behavior-Driven Reconstruction" (BDR) is the key to Replay's superior performance, especially in the context of internationalization. By understanding the behavior rather than just the appearance, Replay can generate code that adapts to different languages and cultural contexts seamlessly.

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

Here's how Replay can be used to build a fully internationalized UI from a design video:

Step 1: Record the Design Video#

Record a video of a designer interacting with the UI prototype. This video should showcase all the key user flows and interactions, demonstrating how the UI responds to different inputs. Ensure the video includes examples of how different languages might affect the layout (e.g., longer text strings).

💡 Pro Tip: Speak aloud while recording the video, narrating your actions and explaining the intended behavior. This provides valuable context for Replay's AI engine.

Step 2: Upload to Replay and Initiate Reconstruction#

Upload the video to the Replay platform and initiate the reconstruction process. Replay's AI engine, powered by Gemini, will analyze the video, identifying UI elements, user interactions, and the underlying logic.

Step 3: Review and Refine the Generated Code#

Replay generates clean, functional code that mirrors the behavior demonstrated in the video. Review the generated code and make any necessary refinements. Pay close attention to areas where internationalization might require adjustments, such as text wrapping or layout adjustments.

📝 Note: Replay automatically handles many common internationalization challenges, such as right-to-left languages and currency formatting.

Step 4: Implement Language Switching#

Replay generates code that is easily adaptable to different languages. You can implement language switching using a simple dropdown menu or other UI element. Here's an example of how to implement language switching using React and a translation library:

typescript
// Example of language switching in React
import React, { useState, useEffect } from 'react';
import { useTranslation } from 'react-i18next';

const LanguageSwitcher = () => {
  const { i18n } = useTranslation();
  const [currentLanguage, setCurrentLanguage] = useState(i18n.language);

  useEffect(() => {
    setCurrentLanguage(i18n.language);
  }, [i18n.language]);

  const changeLanguage = (lng: string) => {
    i18n.changeLanguage(lng);
    setCurrentLanguage(lng);
  };

  return (
    <div>
      <select value={currentLanguage} onChange={(e) => changeLanguage(e.target.value)}>
        <option value="en">English</option>
        <option value="es">Español</option>
        <option value="fr">Français</option>
      </select>
    </div>
  );
};

export default LanguageSwitcher;

Step 5: Test and Iterate#

Test the internationalized UI thoroughly, ensuring that all text is translated correctly and that the layout adapts appropriately to different languages. Use Replay's built-in testing tools to identify and fix any issues.

Replay's Key Features for Internationalization#

Replay offers several key features that simplify the process of building internationalized UIs:

• •Multi-Page Generation: Replay can generate code for entire multi-page applications, ensuring consistency across all screens.
• •Supabase Integration: Replay seamlessly integrates with Supabase, allowing you to store and manage translations in a centralized database.
• •Style Injection: Replay allows you to inject custom styles based on the selected language, ensuring that the UI looks and feels native to each language.
• •Product Flow Maps: Replay generates visual flow maps of user interactions, making it easy to understand and optimize the user experience for different languages.

Challenging the Status Quo#

The traditional approach to internationalization involves:

1. •Designing the UI in a single language.
2. •Extracting text strings for translation.
3. •Manually translating the strings.
4. •Re-integrating the translated strings into the UI.
5. •Testing and adjusting the layout for each language.

This process is time-consuming, error-prone, and often results in inconsistent user experiences. Replay eliminates these manual steps, automating the entire process and ensuring that the internationalized UI is pixel-perfect and behaviorally consistent across all languages.

⚠️ Warning: Manually translating UI strings without considering the context of user interactions can lead to confusing and frustrating user experiences.

Replay in Action: Real-World Examples#

Imagine a complex e-commerce platform with thousands of products and intricate user flows. Manually translating and testing this platform for multiple languages would be a monumental task. With Replay, you can simply record a video of a user navigating the platform in one language, and Replay will generate a fully internationalized version that adapts seamlessly to other languages.

Another example is a mobile app with dynamic content that changes based on user preferences. Replay can analyze a video of a user interacting with the app and generate code that automatically adjusts the layout and content based on the selected language.

The Future is Behavior-Driven#

Replay represents a paradigm shift in UI development. By focusing on user behavior rather than static images, Replay enables developers to build more dynamic, adaptable, and internationalized UIs with less effort. The days of manual translation and endless design iterations are over. The future is behavior-driven, and Replay is leading the way.

Frequently Asked Questions#

Is Replay free to use?#

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

How is Replay different from v0.dev?#

While v0.dev uses text prompts to generate UI components, Replay uses video analysis to reconstruct entire user interfaces, capturing user behavior and generating more accurate and functional code. Replay's behavior-driven approach is especially beneficial for complex UIs and internationalization.

What languages does Replay support?#

Replay supports all major programming languages and frameworks, including React, Angular, Vue.js, and more.

How accurate is Replay's code generation?#

Replay's code generation accuracy is constantly improving. In our internal tests, Replay achieves an average accuracy rate of over 90%, significantly higher than screenshot-to-code tools.

Does Replay support right-to-left languages?#

Yes, Replay automatically detects and supports right-to-left languages.

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