Synchrony – AI-Powered Multi-Game Mobile App | React Native + Firebase

Synchrony is a premium, production-ready React Native (Expo) mobile application featuring 6 unique AI-powered game modes. Each mode delivers a dynamic, replayable experience powered by real-time AI generation—no two sessions are ever the same.

Built with a sleek, dark-themed UI, secure Firebase backend, multi-language support, and a monetization-ready token system—Synchrony is ready to publish on Google Play right out of the box.

iOS Note: This app is built with Expo (React Native), which is inherently cross-platform. The codebase uses no platform-specific native modules, so iOS compatibility is expected. However, the app has been primarily developed and tested on Android. iOS has not been personally tested by the author. If you plan to publish on the App Store, please test on an iOS device or simulator before submission.

Demo Application

Due to the real-time AI generation architecture and to prevent unauthorized API abuse, a public, direct download link for the demo APK is not provided.

If you are a serious buyer and would like to test the application on your own device before purchasing, please send an email. We will promptly provide you with a secure, temporary demo link so you can experience the app firsthand.

6 AI-Powered Game Modes

Mystery
Step into the shoes of a detective. AI generates a unique crime scene, suspects, and clues. Interrogate witnesses, investigate evidence, and solve the case before time runs out. Every case is procedurally generated—infinite replayability.

RPG (Role-Playing)
Create a character, choose a theme (Fantasy, Sci-Fi, Horror, and more), and embark on a fully AI-narrated adventure. Every choice you make shapes the story. Your completed sagas are saved to the archive for you to revisit.

Survival
You wake up in a dangerous scenario generated by AI. Manage your health, make critical decisions each turn, and try to survive as long as possible. Three difficulty levels challenge players of all skill levels.

Ruler
Rule an AI-generated universe. Every turn, you face a new dilemma with multiple choices—each decision impacts your civilization’s resources. Balance your empire or watch it crumble. Enter any theme you want and the AI builds a world around it.

Quiz
Enter any topic and the AI generates 10 unique multiple-choice questions with three difficulty tiers (Amateur, Skilled, Pro). Perfect for learning, trivia nights, or just testing your knowledge on anything imaginable.

Court
Play as a defense attorney or prosecutor in AI-generated court cases. Present arguments, cross-examine witnesses, and convince the judge. Choose from criminal, civil, or corporate case types.

Key Features

Multi-AI Engine Support—Supports Google Gemini, OpenAI (GPT), and Anthropic Claude. Switch with a single config change.
Secure Backend—Firebase Cloud Functions proxy. Your API key is NEVER exposed in the app.
Token System—Built-in token economy with per-request cost tracking, milestone alerts, and balance management.
In-App Purchases—IAP-ready architecture with server-side receipt validation (Google Play and App Store).
8 Languages ~~- English, Turkish, German, Spanish, French, Italian, Portuguese, Russian -~~ fully translated.
Archive System—Every completed game is saved to a beautiful archive with full history, stats, and details.
Onboarding Tutorial—Interactive spotlight tutorial guides new users through the app on first launch.
Sound Effects—Immersive UI sound effects for buttons, navigation, and game events.
Background Music—Optional BGM system. Drop in your own music files and enable with one line.
Dark Premium UI—Sleek monospace typography, smooth animations, and a polished dark theme throughout.
Customizable—Easily change colors, game parameters, initial tokens, AI difficulty, and more.
Clean Codebase—TypeScript, modular architecture, well-commented code, and comprehensive documentation.

Tech Stack

React Native (Expo)—Cross-platform iOS and Android
TypeScript—Type-safe, maintainable codebase
Zustand—Lightweight, persistent state management
Firebase Cloud Functions—Secure serverless AI proxy
Firebase Firestore—Token balance and user data storage
i18next—Full internationalization framework
Expo Router—Modern file-based routing

What’s Included

Full React Native (Expo) source code
Firebase Cloud Functions backend source code
Step-by-step Setup Guide (deploy in under 5 minutes)
Customization Guide (colors, tokens, AI engine, BGM, and more)
IAP Setup Guide (receipt validation for real-money token sales)
8 complete language translation files
All game assets (images, sounds, icons)

Requirements

Node.js 18+
Firebase account (Blaze plan for Cloud Functions)
AI API key (Gemini is free to start, OpenAI/Claude also supported)
Expo CLI for building APK/IPA

Quick Start

Run npm install to install dependencies
Set up a Firebase project and deploy the Cloud Function
Add your API endpoint to .env
Run npx expo start—your app is live!

Full details are provided in the included SETUP_GUIDE.md.

Security First

Unlike many AI apps that embed API keys directly in the client, Synchrony routes all AI requests through your own Firebase Cloud Function. This means:

Your API key stays on Google’s servers—never in the APK
You control rate limiting and access
Token balances are managed server-side and tamper-proof

Monetization Ready

Synchrony includes a complete token economy:

Users start with configurable free tokens
Each AI interaction costs tokens
IAP integration lets users purchase more tokens
Server-side receipt validation prevents fraud
Fully customizable pricing and token amounts

Multi-Language Support

All UI text, game instructions, tutorial messages, and system strings are fully translated into 8 languages using the i18next framework. Adding new languages is as simple as creating a new JSON file.

Supported: English, Turkish, German, Spanish, French, Italian, Portuguese, Russian

Documentation

Every aspect of setup and customization is covered in detailed, beginner-friendly guides:

SETUP_GUIDE.md—Firebase setup, deployment, and app connection
CUSTOMIZATION_GUIDE.md—Colors, tokens, AI engines, BGM, and UI tweaks
IAP_SETUP_GUIDE.md—In-app purchase configuration and receipt validation

Synchrony is not just a template—it’s a complete, polished product ready for the app stores. Buy it, deploy it, and start earning.

Synchrony - Expo AI Powered Game with Token System