Overview

NativeBridge is a production-ready code conversion tool that transforms entire iOS apps to Android (and vice versa) with 96% simple SwiftUI accuracy, 75-80% complex, 107+ conversion patterns, and automatic library detection. Our intelligent conversion engine analyzes your code structure, detects libraries (Alamofire, Realm, Firebase), auto-generates build.gradle with all dependencies, and converts SwiftUI → Jetpack Compose and UIKit → Android Views.

Key Features

Quick Start

Converting your first file takes less than a minute:

Supported Formats

Understanding Project Sizes

NativeBridge pricing is based on LOC (Lines of Code), not individual files. Here's how to estimate your needs:

Single File Conversion

Single file mode is the default conversion method. Upload one file at a time and receive the converted output directly.

How It Works

struct User {
    let id: UUID
    var name: String
    var email: String?

    func displayName() -> String {
        return name.capitalized
    }
}

data class User(
    val id: UUID,
    var name: String,
    var email: String? = null
) {
    fun displayName(): String {
        return name.replaceFirstChar { it.uppercase() }
    }
}

Batch Processing

Batch mode allows you to convert entire project directories at once. Upload a ZIP file containing your source files and receive a converted ZIP with the same folder structure.

ZIP Requirements

Progress Tracking

During batch conversion, you'll see real-time progress including:

API Mapping

When NativeBridge detects platform-specific APIs in your code, it provides a configuration screen with mapping options.

Detected API Categories

Mapping Options

For each detected API, you can choose:

Output Package

Complex conversions generate a ZIP package containing multiple files to help you integrate the converted code.

Package Contents

project-converted/
├── README.md              # API mapping summary
├── TODO-CHECKLIST.md      # Integration tasks
├── converted/             # Converted source files
│   └── [your files].kt
└── templates/             # Generated helper files
    └── [helper files].kt

README.md

Contains a summary of the conversion including:

TODO-CHECKLIST.md

A markdown checklist of tasks to complete your integration:

Swift to Kotlin

Key transformations when converting from Swift to Kotlin:

Kotlin to Swift

Key transformations when converting from Kotlin to Swift:

Type Mapping

Standard library type mappings:

Platform APIs

Platform-specific APIs cannot be directly converted. NativeBridge detects these and provides mapping suggestions.

iOS APIs Detected

Android APIs Detected

SwiftUI → Jetpack Compose

NativeBridge converts SwiftUI to Jetpack Compose with 96% accuracy on simple patterns, 75-80% on complex patterns. This comprehensive guide shows how each SwiftUI component maps to its Compose equivalent.

Layout Components

Lists & Grids

State Management

Input & Forms

Navigation

Styling & Modifiers

Animations & Gestures

Responsive Design

Complex Forms

UIKit → Android Views

NativeBridge converts 26 UIKit patterns to Android Views with XML layouts. Each UIViewController maps to an Activity with corresponding XML resources.

Controllers & Activities

Text & Display

Input Controls

Selection Controls

Progress Indicators

Collections & Lists

Navigation

Layout & Constraints

Scroll & Refresh

Dialogs & Alerts

Advanced Interactions

Auto-Generated build.gradle

NativeBridge automatically generates a complete build.gradle file with all required dependencies based on detected libraries. This achieves 85%+ compilation rate out of the box.

How It Works

Example Output

If your Swift code uses Alamofire, Realm, and Kingfisher, the generated build.gradle includes:

// Auto-generated by NativeBridge
plugins {
    id 'com.android.application'
    id 'org.jetbrains.kotlin.android'
    id 'kotlin-kapt'
    id 'kotlin-parcelize'
}

dependencies {
    // Networking (Alamofire → Retrofit)
    implementation 'com.squareup.retrofit2:retrofit:2.9.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
    implementation 'com.squareup.okhttp3:okhttp:4.12.0'

    // Database (Realm → Room)
    implementation 'androidx.room:room-runtime:2.6.1'
    kapt 'androidx.room:room-compiler:2.6.1'
    implementation 'androidx.room:room-ktx:2.6.1'

    // Image Loading (Kingfisher → Coil)
    implementation 'io.coil-kt:coil-compose:2.5.0'

    // Coroutines
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.3'
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.3'
}

Supported Libraries

How to Use

Smart TODO Templates

When full automatic conversion isn't possible, NativeBridge generates working code templates with inline examples. These aren't just comments—they're copy-paste ready implementations.

What Are TODO Templates?

TODO templates provide functional code scaffolds for patterns that require manual customization. Each template includes:

• Original code: Your Swift code preserved as a comment for reference
• Working implementation: Kotlin code ready to use
• Inline documentation: Explanations of the conversion approach
• Usage examples: How to integrate the converted code

Example: Network Request

// TODO: ALAMOFIRE → RETROFIT CONVERSION
// Original Swift: AF.request(urlString).responseJSON { response in ... }
//
// Retrofit equivalent:
interface ApiService {
    @GET("endpoint")
    suspend fun getData(): Response<JsonObject>
}

// Usage in ViewModel:
viewModelScope.launch {
    try {
        val response = retrofit.create(ApiService::class.java).getData()
        // Handle response
    } catch (e: Exception) {
        // Handle error
    }
}

When Templates Are Used

Conversion Examples

Real-world examples showing complete conversions from Swift to Kotlin.

SwiftUI View → Jetpack Compose

A common user profile screen with state management and navigation:

struct ProfileView: View {
    @State private var username = ""
    @State private var isEditing = false

    var body: some View {
        VStack(spacing: 20) {
            Text("Profile")
                .font(.title)

            TextField("Username", text: $username)
                .textFieldStyle(RoundedBorderTextFieldStyle())

            Button("Edit") {
                isEditing.toggle()
            }
        }
        .padding()
    }
}

@Composable
fun ProfileView() {
    var username by remember { mutableStateOf("") }
    var isEditing by remember { mutableStateOf(false) }

    Column(
        modifier = Modifier
            .fillMaxWidth()
            .padding(16.dp),
        verticalArrangement = Arrangement.spacedBy(20.dp)
    ) {
        Text(
            text = "Profile",
            style = MaterialTheme.typography.titleLarge
        )

        OutlinedTextField(
            value = username,
            onValueChange = { username = it },
            label = { Text("Username") },
            modifier = Modifier.fillMaxWidth()
        )

        Button(onClick = { isEditing = !isEditing }) {
            Text("Edit")
        }
    }
}

Data Model Conversion

Converting Swift structs to Kotlin data classes:

struct User: Codable {
    let id: UUID
    var name: String
    var email: String?
    var isActive: Bool
}

@Serializable
data class User(
    val id: UUID,
    var name: String,
    var email: String? = null,
    var isActive: Boolean
)

Library Conversions

NativeBridge automatically converts 14 popular iOS libraries to their Android equivalents. All conversions are listed in the build.gradle section above.

Supported Conversions

The following library conversions are fully automated:

• Alamofire → Retrofit: HTTP networking with request/response handling
• Realm → Room: Local database persistence with migrations
• RxSwift → Kotlin Flow: Reactive programming patterns
• Kingfisher → Coil: Asynchronous image loading and caching
• KeychainAccess → EncryptedSharedPreferences: Secure key-value storage
• URLSession → OkHttp: HTTP client for REST APIs
• Firebase iOS SDK → Firebase Android SDK: Authentication, Firestore, Analytics
• Combine → Kotlin Flow: Reactive data streams

Each library conversion includes proper imports, initialization code, and usage examples. See the Auto-Generated build.gradle section for complete dependency information.

Code Preparation

For best results, prepare your code before conversion:

Post-Conversion

After conversion, follow these steps to integrate your code:

Troubleshooting