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I will build a flutter app with ai chat, firebase backend and subscription paywall
Sam
About this gig
Are you building a mobile app powered by AI a coaching app, sports recruitment tool, health assistant, or AI companion?
You are in the right place.
I build complete, production-ready Flutter apps for iOS and Android with AI chat (GPT-4), Firebase backend, user onboarding, and subscription paywalls everything you need to launch and monetize.
WHAT I BUILD FOR YOU
- AUTH & ONBOARDING
- Firebase Auth (email, Google, Apple sign-in)
- Custom onboarding profile form (name, age, sport, GPA, schools any fields you need)
- Terms of Service acceptance screen
- Firestore database for user profiles
AI CHAT (GPT-4 / OpenAI)
- Full chat interface connected to OpenAI API
- Every message sends: YOUR system prompt + user profile + full chat history
- You can update your system prompt anytime I give you simple instructions
- Chat history saved per user in Firestore
- Clean, modern chat UI (iMessage-style bubbles)
PAYWALL & SUBSCRIPTIONS
- Monthly subscription via RevenueCat + StoreKit (iOS) / Google Play Billing (Android)
- Apple Offer Code support give free access to specific users
- App built to pass Apple App Store review guidelines
- Paywall screen with clear pricing and CTA
Contact Me Now! and Let's get started
Get to know Sam
Sam
Flutter app developer, Backend development, React Native Mobile App
- FromUnited States
- Member sinceMay 2026
- Avg. response time1 hour
Languages
English, Dutch, German, Spanish
Flutter & Firebase developer with 4+ years building production-ready iOS and Android apps for clients worldwide.
I specialize in turning ideas into real, working apps with clean code, smooth UI, and zero guesswork on delivery.
What I bring to every project:
✅ Firebase Auth, Firestore & cloud storage
✅ GPT-4 AI chat integration
✅ Subscription paywalls (StoreKit/RevenueCat)
✅ App Store & Play Store submission
I don't just write code I solve problems. Every app I deliver is tested, documented, and built to scale.
Let's build something great.
FAQ
Do I need to provide my own OpenAI API key?
Yes. You will need your own OpenAI API key this keeps your costs under your control. I will show you exactly where to add it in the app. Setup takes under 2 minutes.
Can I update the AI system prompt after the app is live?
Absolutely. I store the system prompt in Firestore so you can update it from the Firebase console anytime no code changes, no resubmitting to the App Store. I give you a simple one-page guide on how to do it.
Will the app pass Apple App Store review?
Yes. The app is built following Apple's Human Interface Guidelines and App Store review rules including proper paywall disclosure, subscription terms, and restore purchases functionality. I have experience getting AI apps approved.
Can you give free access to specific users (Apple Offer Codes)?
Yes. The subscription is built with RevenueCat + StoreKit, which fully supports Apple Offer Codes. You can generate codes directly in App Store Connect and share them with any user for free access.
Do you build for Android too, or iOS only?
Since the app is built in Flutter, it works on both iOS and Android from a single codebase. Android uses Google Play Billing for subscriptions. Just let me know your target platform when you message me.
Will I own the full source code?
Yes. You receive the complete Flutter source code at delivery. You own it 100%. I do not keep any backdoor access or claim any rights to your app.
Can I add custom profile fields for my specific use case?
Yes. The onboarding form is fully customizable. Whether you need sport, GPA, position, graduation year, or any other fields just tell me and I will build it exactly as you need.
What do I need to provide to get started?
Just three things: (1) your AI system prompt or a description of your AI's role, (2) the profile fields you want to collect during onboarding, and (3) your app name and any branding/color preferences. I handle everything else.
