Rork Max × Google Stitch × Antigravity: Complete AI-Driven Native App Workflow

Setup and context: Three AI Tools That Are Rewriting App Development

In 2026, the most powerful combination for mobile app development is the Rork Max × Google Stitch × Antigravity triple-AI workflow. By connecting tools that each excel in their own domain, solo developers and small teams can now go from design concept to App Store submission in a single day.

• Google Stitch: Generates polished UI designs (HTML/CSS) from natural language prompts. No designer needed.
• Google Antigravity: Integrates with Stitch via MCP, using AI agents to transform designs into production-quality code.
• Rork Max: Takes the generated code and builds native SwiftUI apps, compiling on cloud Macs for one-click App Store submission.

This article walks through a complete end-to-end tutorial using a health tracking app as a real-world example. As a premium resource, it includes working code, actual prompts, architectural patterns, and common pitfall avoidance.

What you'll learn:

• Correctly setting up Google Stitch + Antigravity MCP integration
• Best practices for importing Stitch designs into Rork Max
• Implementing a subscription monetization model with StoreKit 2
• Performance optimization and quality assurance steps
• App Store submission checklist for first-pass approval

Target audience: Developers who are comfortable with Rork basics and want to build more sophisticated apps efficiently (intermediate to advanced)

Prerequisites and Environment Setup

Required Tools and Accounts

Important: Rork Max is a separate product from the original Rork (React Native). It generates native SwiftUI code. Review the Rork pricing guide before getting started.

Adding the Stitch MCP Server to Antigravity

Stitch is officially available in Antigravity's MCP store.

1. Go to ai.google.dev/antigravity and open Antigravity
2. In the left sidebar, click MCP Servers → + Add Server
3. Search for "Stitch" and select the official MCP
4. Generate your API key in Stitch: open the Stitch app → Exports panel → Get API Key
5. Paste the API key into Antigravity's configuration form and click Connect

// Antigravity MCP configuration example (settings.json)
{
  "mcpServers": {
    "stitch": {
      "name": "Google Stitch",
      "apiKey": "YOUR_STITCH_API_KEY",
      "tools": [
        "generate_screen",
        "edit_screen",
        "export_html_css",
        "create_variant"
      ]
    }
  }
}

Once connected, you can call Stitch functions directly from Antigravity prompts using @stitch.

Concepts and Architecture: Why This Triple-AI Stack Wins

Traditional Workflow vs. the New Stack

Traditional no-code development involved disconnected stages: designing in Figma, manually importing to FlutterFlow or Adalo, and separately implementing native features. A process that took days now takes hours.

[Traditional Workflow]
Figma (design) → Manual code conversion → FlutterFlow/React Native → Native features
Time: 3–7 days

[Triple-AI Workflow]
Google Stitch (AI design) → Antigravity (code gen) → Rork Max (native SwiftUI)
Time: 4–8 hours

Role of Each Tool

Google Stitch serves as the "visual design AI engine." It generates complete UIs from text prompts with consistent color palettes, typography, and component layouts — particularly valuable for solo developers without a dedicated designer.

Antigravity acts as the "AI code agent." With the Stitch MCP integration, it references your actual design files in real-time as it generates code, dramatically reducing the typical drift between design intent and implementation.

Rork Max is the final stage of the pipeline — the "native SwiftUI compilation environment." You merge the Antigravity-generated code into a Rork Max project, then build, simulate, and submit to the App Store with a single click using cloud Macs.

For more context, see our Rork vs FlutterFlow comparison and the Rork Max AI Features guide.

Step-by-Step Implementation: Building a Health Tracking App

Step 1: Design the Main Screen in Google Stitch

Open Stitch and enter a detailed design prompt:

Create a health tracking app UI with:
- Home screen: daily step count, calorie intake, water intake with circular progress rings
- Color scheme: white background, mint green (#00C896) as primary, dark gray (#1A1A2E) for text
- Typography: SF Pro Display for headings, SF Pro Text for body
- Bottom navigation: Home, Nutrition, Workout, Profile tabs
- Card-based layout with subtle shadows (8px blur, 10% opacity)
- iOS 17+ style with rounded corners (16px radius)

If the generated design needs refinement, use the screen editing tools. You can also control Stitch from within Antigravity:

// Editing a Stitch screen from inside Antigravity via MCP
@stitch edit_screen "home_screen" --instruction "Make the step count ring bigger and add a weekly trend sparkline below it"

Step 2: Convert the Design to Code in Antigravity

With the Stitch MCP connected, run the following prompt in Antigravity:

Using the @stitch "health_app_home" design, generate SwiftUI code for:
1. HomeView with CircularProgressView components for steps, calories, water
2. Use @Observable macro for state management (iOS 17+)
3. Implement smooth animations using withAnimation(.spring(duration: 0.5))
4. Add HapticFeedback on ring completion
5. Data model: HealthMetric struct with id, type, value, goal, date

Example of the SwiftUI code Antigravity generates:

// CircularProgressView generated by Antigravity from Stitch design
import SwiftUI
 
struct CircularProgressView: View {
    let value: Double      // Current value (e.g., 6500 steps)
    let goal: Double       // Target value (e.g., 10000 steps)
    let color: Color       // Ring color
    let label: String      // Label ("Steps", etc.)
 
    private var progress: Double {
        min(value / goal, 1.0)
    }
 
    var body: some View {
        ZStack {
            // Background ring
            Circle()
                .stroke(color.opacity(0.15), lineWidth: 12)
 
            // Progress ring
            Circle()
                .trim(from: 0, to: progress)
                .stroke(
                    color,
                    style: StrokeStyle(lineWidth: 12, lineCap: .round)
                )
                .rotationEffect(.degrees(-90))
                .animation(.spring(duration: 0.8), value: progress)
 
            // Center text
            VStack(spacing: 2) {
                Text("\(Int(value))")
                    .font(.system(size: 22, weight: .bold, design: .rounded))
                    .foregroundStyle(.primary)
                Text(label)
                    .font(.caption2)
                    .foregroundStyle(.secondary)
            }
        }
        .frame(width: 100, height: 100)
    }
}
 
// Expected output: A smooth animated progress ring that updates with spring animation
// whenever the value changes

Step 3: Import Code into Rork Max and Build the Project

Create a new Rork Max project and import the Antigravity-generated code:

1. In Rork Max, select New Project → Import from code
2. Drag and drop the .swift files exported from Antigravity
3. Rork Max automatically organizes the project structure and fills in missing components

Then instruct Rork Max via chat to add the remaining features:

Add these features to the health app:
1. HealthKit integration to read real step count and calorie data
2. UserNotifications for daily reminders at 8:00 AM
3. Core Data persistence for storing historical data (last 30 days)
4. StoreKit 2 for premium subscription ($4.99/month, $39.99/year)
   - Premium features: detailed analytics, unlimited history, export to CSV

Step 4: Implementing Subscription Billing with StoreKit 2

Here's the subscription manager code Rork Max generates:

// SubscriptionManager generated by Rork Max using StoreKit 2
import StoreKit
 
@Observable
class SubscriptionManager {
    var isPremium: Bool = false
    var products: [Product] = []
 
    // Product IDs configured in App Store Connect
    let productIDs = [
        "com.yourapp.health.monthly",   // $4.99/month
        "com.yourapp.health.yearly"     // $39.99/year (~33% savings)
    ]
 
    init() {
        Task {
            await loadProducts()
            await updateSubscriptionStatus()
        }
    }
 
    func loadProducts() async {
        do {
            products = try await Product.products(for: productIDs)
        } catch {
            print("Failed to load products: \(error)")
        }
    }
 
    func purchase(_ product: Product) async throws {
        let result = try await product.purchase()
        switch result {
        case .success(let verification):
            let transaction = try checkVerified(verification)
            await transaction.finish()
            await updateSubscriptionStatus()
        case .userCancelled, .pending:
            break
        @unknown default:
            break
        }
    }
 
    func updateSubscriptionStatus() async {
        for await result in Transaction.currentEntitlements {
            guard case .verified(let transaction) = result else { continue }
            if productIDs.contains(transaction.productID) {
                isPremium = transaction.revocationDate == nil
            }
        }
    }
 
    private func checkVerified<T>(_ result: VerificationResult<T>) throws -> T {
        switch result {
        case .unverified:
            throw StoreError.failedVerification
        case .verified(let safe):
            return safe
        }
    }
}
 
enum StoreError: Error {
    case failedVerification
}
 
// Usage:
// @Environment(SubscriptionManager.self) var subscriptionManager
// if subscriptionManager.isPremium { /* Show premium content */ }

Step 5: Preparing for App Store Submission

// App Store preparation checklist to specify in Rork Max
1. Build for release (Rork Max → Build → App Store)
2. Add App Privacy manifest (PrivacyInfo.xcprivacy)
3. Set required usage descriptions in Info.plist:
   - NSHealthShareUsageDescription: "Read step count and calorie data to display health metrics"
   - NSHealthUpdateUsageDescription: "Record workout data to your Health app"
   - NSUserNotificationsUsageDescription: "Send daily health reminders to keep you on track"

Advanced Patterns: Getting the Most from All Three Tools

Pattern 1: AI-Generated UI Variants for A/B Testing

Use the Stitch MCP to rapidly generate multiple UI variants for A/B testing:

// Generating variants from Antigravity
@stitch create_variant "onboarding_screen" --variants 3 --style "minimal, playful, corporate"

Build each variant in Rork Max, distribute via TestFlight to a small user group, and compare conversion rates. Combined with the TestFlight guide, this approach dramatically accelerates hypothesis testing cycles.

Pattern 2: Reusable Design Systems

Design systems created in Stitch can be saved as component libraries through the MCP tools. Instead of specifying design details for every new screen, simply reference @stitch use_design_system "health_app_ds" and maintain visual consistency throughout the app with minimal effort.

Pattern 3: Rork Max + Cloudflare Workers Backend

Pair Rork Max on the frontend with Cloudflare Workers for a production-grade backend:

// Cloudflare Worker: HealthData API endpoint
export default {
  async fetch(request, env) {
    const url = new URL(request.url);
 
    if (url.pathname === '/api/health/sync' && request.method === 'POST') {
      const { userId, metrics } = await request.json();
 
      // Store in Cloudflare KV for fast reads
      await env.HEALTH_KV.put(
        `user:${userId}:metrics`,
        JSON.stringify({ metrics, updatedAt: Date.now() }),
        { expirationTtl: 86400 * 30 } // Retain for 30 days
      );
 
      return Response.json({ success: true });
    }
 
    return new Response('Not Found', { status: 404 });
  }
};

See the Rork Max + Cloudflare AI Backend guide for the complete setup.

Troubleshooting: Common Issues and Fixes

Issue 1: Stitch Design Not Referenced Correctly in Antigravity

Cause: Expired MCP API key, or a screen ID has changed in Stitch.

Fix:

1. Regenerate and update the Stitch API key in Antigravity's MCP settings
2. Run @stitch list_screens to confirm current screen IDs before generating code

Issue 2: Type Errors When Importing SwiftUI Code into Rork Max

Cause: Antigravity occasionally generates code targeting older iOS APIs.

Fix:

// Additional instruction for Antigravity
"Ensure all generated code targets iOS 17+ minimum.
Use @Observable instead of ObservableObject+@Published.
Use SwiftData instead of Core Data where possible."

Issue 3: HealthKit Data Returns nil on Physical Device

Cause: Missing NSHealthShareUsageDescription or NSHealthUpdateUsageDescription in Info.plist.

Fix: In Rork Max's Info.plist editor, verify both HealthKit usage description strings are present. This is also a common App Store rejection reason, so always double-check before submitting.

Issue 4: StoreKit 2 Subscription Status Resets on App Relaunch

Cause: The Transaction.currentEntitlements listener isn't being called from App.init().

Fix:

@main
struct HealthApp: App {
    @State private var subscriptionManager = SubscriptionManager()
 
    var body: some Scene {
        WindowGroup {
            ContentView()
                .environment(subscriptionManager)
                // Automatically verify subscription status on launch
                .task {
                    await subscriptionManager.updateSubscriptionStatus()
                }
        }
    }
}

Publishing and Monetization

Designing Your Paywall for Conversion

A freemium model that demonstrates value before asking for payment consistently outperforms hard paywalls:

1. Hook users with free features: Basic step count and calorie tracking at no cost
2. Let users experience premium value: Auto-attach a 7-day full trial using StoreKit 2's .introductoryOffer
3. Time the paywall correctly: Show it naturally when users encounter a limitation (e.g., trying to view historical data on day 8)

Setting Up Subscriptions in App Store Connect

App Store Connect setup:
1. Go to App Store Connect → My Apps → [Your App] → Subscriptions
2. Create a new subscription group (e.g., "Premium")
3. Monthly plan: Price $4.99, ID: com.yourapp.health.monthly
4. Annual plan: Price $39.99, ID: com.yourapp.health.yearly
5. Introductory offer: 7-day free trial
6. Upload App Store promotional image (1024×1024)

Revenue Projections

With $4.99/month and $39.99/year, assuming 100 paid conversions per month:

• 80 monthly subscribers × $4.99 = $399.20
• 20 annual subscribers × $39.99/12 = $66.65
• Monthly MRR: ~$466
• After Apple's 30% commission: ~$326/month

For strategies to reach those first hundreds of users, see the Global ASO Guide for Rork.

Conclusion

The Rork Max × Google Stitch × Antigravity triple-AI workflow represents one of the most efficient paths to native app development in 2026.

The key insight is clear division of labor between AI tools: delegate visual design to Stitch, code transformation to Antigravity, and native compilation and submission to Rork Max. Each tool handles what it does best, and the MCP integration keeps them tightly in sync.

Your 3-step starting point:

1. Add the Stitch MCP server to Antigravity (10 minutes)
2. Generate 2–3 key screens for your app idea in Stitch (30 minutes)
3. Convert to code in Antigravity and import into Rork Max (1–2 hours)

Whether you're building health, fitness, productivity, or entertainment apps, this workflow applies across virtually every category. Start today — your App Store launch is closer than you think.