Real answers, real methodology
Every page answers one specific developer question. No filler. Each answer includes what to do, why, common mistakes, and (where relevant) authoritative sources.
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Where should I store AI API keys in a Flutter app?
Never in the Flutter bundle. Store AI API keys on a server you control (Supabase Edge Function, Firebase Cloud Function, or Cloudflare Worker) and have the app call your server, which calls the AI provider.
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How do I add in-app account deletion to a Flutter app?
Add a "Delete my account" button in Settings that calls a server-side function which (1) deletes the auth user, (2) deletes user-owned data across tables, and (3) cancels any active RevenueCat subscription. All in one atomic flow.
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How do I implement Restore Purchases with RevenueCat in Flutter?
Call Purchases.restorePurchases() when the user taps a "Restore" button, then re-check entitlements. If the restored entitlement is active, unlock the paywall immediately.
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Why was my AI-built app rejected by Apple?
Almost every AI-built app first-rejection falls into one of six buckets: 4.3 spam, 2.3 misleading metadata, missing privacy label, missing account deletion, broken restore purchases, or a broken support URL. Address them explicitly before resubmitting.
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Supabase or Firebase for an AI-built mobile app?
For AI-built apps, Supabase is safer by default because row-level security is enforced in Postgres and easier to review. Firebase is better if you need Google-scale free tier or heavy real-time push. Both are production-viable.
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How do I protect user data with row-level security in Supabase?
Enable RLS on every table, add a policy <code>USING (auth.uid() = user_id)</code>, and make sure every insert sets user_id = auth.uid(). Postgres enforces the rest.
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How do I add subscriptions to a Flutter app with RevenueCat?
Create products in both stores, group them into a RevenueCat offering, install purchases_flutter, present a paywall that calls Purchases.purchasePackage(), and gate premium features on the entitlement returned by Purchases.getCustomerInfo().
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How do I turn an AI-generated prototype into a production mobile app?
A prototype becomes production when it clears five thresholds: (1) no hardcoded secrets, (2) authenticated data access with RLS, (3) restore purchases working, (4) crash + analytics instrumented, (5) a support channel a customer can reach.
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How much does it cost to launch a mobile app in 2026?
Minimum cash costs: $99/year for the Apple Developer Program, $25 one-time for the Google Play Developer account. Everything else — backend, subscriptions, analytics — has a real free tier for launch.
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What are the key differences between App Store and Google Play in 2026?
App Store enforces metadata and privacy manually; Play enforces target SDK and Data Safety automatically. Play requires 20 testers for personal accounts opened after Nov 2023; Apple does not. Both require account deletion.