Multi Calculator – All in one calculator app

✨ Key Features

• 🧮 Standard Calculator: Perform all basic arithmetic operations with memory functions.
• 🔬 Scientific Calculator: Supports trigonometric, logarithmic, and exponential functions.
• 💱 Currency Converter: Real-time exchange rate updates for global currencies.
• 📏 Unit Converter: Convert length, weight, area, temperature, time, and more.
• 💰 Financial Tools: Loan calculator, interest computation, and investment ROI tools.
• ❤️ Health Calculators: BMI, BMR, calorie, and body fat estimators.
• 🔢 Date & Age Calculator: Calculate age, days between dates, or due dates precisely.
• 📱 Multi-Theme UI: Clean and modern interface with light/dark modes.
• 🌐 Offline Support: Works perfectly without an internet connection.
• 🧩 Modular Architecture: Independent modules for quick maintenance and updates.

⚙️ Technical Stack

• Language: Flutter (Dart) / Java (Android) / Swift (iOS)
• Backend: Local processing (no server dependency)
• Database: SQLite (for saved conversions and logs)
• Frameworks: Material Design, Provider / Bloc state management
• API Integrations: Optional currency and finance APIs (open-exchange or free-forex)
• Requirements: Android 6.0+, iOS 13+, or Flutter Web runtime

The app is optimized for cross-platform deployment, ensuring consistent performance across devices.

🧩 Installation Guide

1. Download: Extract the MultiCalculator_App_Source.zip package.
2. Setup: Open the project in Android Studio or VS Code (for Flutter builds).
3. Dependencies: Run flutter pub get or configure Gradle for native builds.
4. Run: Use an emulator or connect your device and execute flutter run or gradlew assembleDebug.
5. Build: Export the APK, AAB, or iOS bundle for distribution.

No external server setup is required — all calculations are done locally for speed and privacy.

📦 Deliverables

• 📱 Full app source code (Flutter / Android Studio project)
• 📄 Documentation & setup instructions
• 🧮 Prebuilt demo APK (if included)
• 🎨 UI/UX assets and icons
• ⚖️ GPL redistribution license

📱 Supported Platforms

• ✔️ Android smartphones & tablets
• ✔️ iOS devices (iPhone, iPad)
• ✔️ Flutter Web / Desktop (optional export)
• ✔️ Works offline and in low-resource environments

Multi Calculator is cross-compiled and highly optimized for performance, ensuring reliable operation across all major operating systems.

🧠 Notes

License Type: Shared under the GPL (GNU General Public License) for learning, testing, and personal use.

Customization Tips:

• Modify color themes and icons in lib/theme/.
• Add custom calculators (e.g., tip, GPA, or mortgage) in modules/.
• Integrate ads or analytics using Google AdMob or Firebase.
• Localize to new languages via l10n/ folder.

SEO Assurance: Structured HTML optimized for keywords like “all-in-one calculator app”, “Flutter calculator source”, “Android iOS math converter app”, and “GPL calculator tool”.

👨‍💻 Original Developer Credit

Originally developed by the app author on CodeCanyon or similar marketplace under the title “Multi Calculator – All in One Calculator App”.

For updates, extended licensing, and commercial rights, visit the original developer’s CodeCanyon page.

Attribution: “Multi Calculator – developed by the original author. This GPL release is provided for educational and testing use only.”

🔒 Disclaimer

Transparency Statement: This version is redistributed under the GPL license for educational and non-commercial purposes. We do not own the original intellectual property or trademarks. All rights remain with their respective creators.

If you require:

• Commercial usage rights or app store publication,
• Ongoing support or updates,
• Removal of original branding or inclusion in paid software,

please purchase the official license directly from the CodeCanyon developer.

By using or redistributing this version, you agree to follow all applicable GPL terms and copyright laws.