After years of building apps, I've come to believe the hardest part isn't implementation — it's deciding how to price the thing.
Rork can generate an app's structural skeleton from a prompt, but monetization design and App Store review know-how still require human judgment. Here's what I've learned about layering a solid revenue model onto a Rork-generated app.
Designing Your Pricing Plan
Subscriptions carry higher psychological resistance than one-time purchases — users have to keep justifying the recurring charge. Reducing that resistance is directly tied to churn rate.
One of the most important decisions is where to draw the free tier line. From my experience building wallpaper and ambient sound apps: limiting usage quantity or storage tends to produce lower drop-off than feature-gating.
The reason is simple: "I want to use this more" converts better than "I can't use this feature without paying." You get users who've already confirmed the value before they're asked to pay.
Free: 3 uses per day, watermark on exports
Pro: Unlimited, no watermark, full-resolution downloads
For Japanese market pricing, ¥500–¥1,000/month is the practical sweet spot — Apple's Tier 3–7 range. Annual plans priced at roughly 60–70% of monthly significantly improve LTV.
Integrating StoreKit into Rork-Generated Code
For React Native / Expo code generated by Rork, I recommend react-native-purchases (RevenueCat) over the native StoreKit APIs directly. The initial setup cost is real, but the cross-platform support and analytics dashboards pay off quickly.
Rork handles the boilerplate well if you give it a structured prompt:
Add a subscription purchase flow using RevenueCat.
Structure it as:
- useSubscription custom hook (manage purchase state)
- SubscriptionScreen (show pricing, purchase button)
- PremiumGate component (block display for non-subscribers)
Return isSubscribed: true after successful purchase.
Before running the generated code, get your product IDs exactly right in the RevenueCat dashboard. Typos here are the single most common cause of failed test purchases.
// RevenueCat initialization (App.tsx or root component)
import Purchases from 'react-native-purchases';
const API_KEY_IOS = 'YOUR_REVENUECAT_IOS_KEY';
const API_KEY_ANDROID = 'YOUR_REVENUECAT_ANDROID_KEY';
export async function initPurchases() {
Purchases.setLogLevel(Purchases.LOG_LEVEL.DEBUG); // dev only
await Purchases.configure({
apiKey: Platform.OS === 'ios' ? API_KEY_IOS : API_KEY_ANDROID,
});
}Sandbox Testing Checklist
Complete sandbox testing on a real device before submitting. Key scenarios to verify:
Purchase flow: Normal purchase → premium features unlock. Also test: what happens if the user taps Cancel on the payment sheet? The app state must not break.
Restore flow: The "Restore Purchases" button must work. Apple's guidelines require it — missing it is a rejection.
Expired subscription simulation: Sandbox compresses periods (monthly = 5-minute renewal cycles). Verify app behavior when a subscription lapses and that the re-subscribe flow is smooth.
Common Rejection Reasons
Three causes account for the majority of billing-related rejections:
Guideline 3.1.1 — Circumventing in-app purchase. Any link or reference to buying outside the App Store is prohibited. Rork-generated code occasionally includes web payment links — always audit for these before submitting.
Guideline 3.1.2(b) — Unclear subscription benefits. What's included must be clearly described in both screenshots and App Store description. "Premium features" alone isn't enough.
Guideline 4.0 — Insufficient functionality. A minimal Rork-generated app submitted as-is may be rejected for feeling thin. Aim for at least 5–7 substantive features.
Always include a test account in your App Review Notes. If the reviewer can't test the subscription flow, the app gets rejected.
Post-Launch Improvement Loop
The two metrics that matter most post-launch: trial-to-paid conversion rate and monthly churn rate.
Low conversion usually traces to one of two causes: the free tier doesn't communicate enough value, or the paywall appears too early. Check RevenueCat's conversion funnel first — are users even reaching the purchase screen?
Target under 5% monthly churn as your starting benchmark. Higher than that, consider push notifications that resurface value, or loyalty discounts for long-term subscribers.
With Rork reducing the time to a working prototype, the competitive edge is shifting away from implementation speed and toward monetization design judgment. That's actually good news — it's a skill worth building.