🏆 COCO – Currency Converter (GPL Source Code Description)

SEO Keywords: currency converter app, exchange rate calculator, Flutter currency app, Android iOS currency converter, forex rates API, offline currency calculator, GPL mobile finance app.

🚀 Overview

COCO – Currency Converter is a simple yet powerful currency exchange calculator app that allows users to convert between multiple global currencies in real-time.
Built with Flutter for Android and iOS, COCO provides fast performance, a modern UI, and accurate exchange rates powered by reliable APIs (such as OpenExchangeRates or CurrencyLayer).

Designed for travelers, business professionals, and students, COCO combines both online and offline conversion capabilities, allowing seamless use even without an internet connection. Its modular structure makes it easy for developers to customize branding, add new features, or connect to their preferred API provider.

✨ Key Features

• 💱 Real-Time Conversion: get instant exchange rates between 150+ global currencies.
• 📶 Offline Mode: cache recent rates for use without internet connection.
• 🌍 Multiple Currency Support: supports USD, EUR, GBP, JPY, CAD, INR, and more.
• 🧮 Smart Calculator: enter any amount and convert automatically as you type.
• 🔄 Auto-Update Rates: fetch latest rates daily or manually refresh via one tap.
• 🎨 Modern Flutter UI: responsive layout with smooth transitions and theme support.
• ⭐ Favorite Currencies: pin and prioritize frequently used currencies.
• 📊 Rate History (optional): view trends for the last 7/30 days if connected to an API with history support.
• 📱 Cross-Platform: single codebase for Android & iOS.
• 💰 AdMob Integration (optional): monetize via banner and interstitial ads.

⚙️ Technical Stack

• Framework: Flutter 3.x (Dart)
• APIs: Open Exchange Rates / CurrencyLayer / FreeCurrencyAPI (configurable)
• State Management: Provider / Riverpod (depending on original source)
• Database: SQLite / SharedPreferences (for offline cache)
• Build Tools: Android Studio / VS Code
• Minimum SDK: Android 6.0 (API 23), iOS 12+

Expertise Note: designed with clean Flutter architecture (Model-View-Controller or Provider pattern) ensuring fast API performance and offline reliability.

🧩 Installation Guide

1. 📦 Download and unzip the project files.
2. 🧰 Open the project in Android Studio or VS Code.
3. ⚙️ Run flutter pub get to install dependencies.
4. 🔑 Set your API key in lib/config/api_config.dart.
5. 🎨 Customize app name, colors, and logo in pubspec.yaml and assets/.
6. ▶️ Run the app with flutter run on emulator or device.
7. 📤 Build the release APK / IPA with flutter build apk or flutter build ios.

📦 Deliverables

• ✅ Full Flutter source code (Android & iOS)
• ✅ Currency API integration scripts
• ✅ Offline caching system (SQLite / SharedPreferences)
• ✅ UI/UX screens (Home, Conversion, Favorites, Settings)
• ✅ Documentation / setup instructions
• ✅ GPL HTML product description (this file)

📱 Supported Platforms

• Mobile OS: Android 6.0+ and iOS 12+
• Devices: smartphones and tablets
• Build Systems: Android Studio, Xcode (for iOS)
• APIs: any REST-based exchange rate provider

🧠 Notes

• License: GPL – can be modified, studied, and redistributed under GNU terms.
• Customization Tips: add crypto currency conversions, historical charts, or offline rate backup syncing.
• SEO Assurance: optimized for “Flutter currency converter app,” “currency exchange calculator,” and “offline forex rate app.”
• Data Policy: no personal data collected; only currency rate requests via secure HTTPS.

👨‍💻 Original Developer Credit

Original design and app structure by the CodeCanyon marketplace author.
This version is redistributed under the GNU General Public License (GPL) for open-source educational and non-commercial use.
Reference: Original Marketplace Listing.

🔒 Disclaimer

Distributed under the GNU General Public License (GPL).
Not affiliated with OpenExchangeRates, Flutter, or Google.
All product names and demo data belong to their respective owners.

• Replace API keys before production deployment.
• Verify exchange rate accuracy with your API provider.
• Do not redistribute commercially without following GPL terms.

🧪 Example Input Usage

“Write an HTML description for ‘COCO – Currency Converter’ – a Flutter-based currency conversion app with real-time and offline exchange rate features, following the above GPL-compliant structure for redistribution on wpshop.net.”