Expense Tracker

Recently updated to follow the MVVM architectural pattern with Provider state management for enhanced maintainability and reactive updates.

A beautiful, cross-platform expense tracking application built with Flutter and Material 3 design. Track your spending, categorize expenses, and visualize your financial habits with interactive charts.

Overview

The Expense Tracker is a comprehensive financial management application engineered with Flutter and Material 3 design principles. This project demonstrates modern mobile development practices, featuring the MVVM architectural pattern with Provider state management for robust, scalable code organization. The application transforms everyday expense tracking into an engaging, data-driven experience that empowers users to make informed financial decisions.

Key Features

• 📊 Expense Categorization - Organize expenses into 5 distinct categories: Food, Travel, Leisure, Work, and Utilities with intuitive icons
• 📈 Interactive Analytics - Dynamic charts and visualizations to track spending patterns and trends over time
• ➕ Full Expense Management - Complete CRUD operations for adding, editing, and deleting expenses with validation
• 🎨 Material 3 Design - Modern design system with seamless light and dark theme support
• 📱 Cross-Platform Support - Native performance across Android, iOS, Web, and Desktop platforms
• 🔄 Reactive State Management - Provider pattern with ChangeNotifier for real-time UI updates
• 💾 Persistent Local Storage - Reliable data persistence with unique expense identifiers using UUID
• 🌐 Responsive UI - Adaptive layouts that work beautifully on all screen sizes and orientations

Technology Stack

• Flutter: >=3.3.0 <4.0.0 - Cross-platform UI framework with Material 3 support
• Dart: >=3.3.0 <4.0.0 - Strongly typed programming language with null safety
• Provider: ^6.1.5+1 - State management solution for reactive UI updates
• Intl: ^0.20.2 - Internationalization and date formatting utilities
• UUID: ^4.3.3 - Unique identifier generation for expense records

Architecture & Implementation

MVVM Pattern Implementation

This project follows the Model-View-ViewModel (MVVM) architectural pattern for clean separation of concerns:

• Models (data/models/): Expense data structures and business logic
• ViewModels (viewmodels/): State management and data transformation logic
• Views (views/): UI components and presentation layer

State Management

State management is handled through Provider with ChangeNotifier, enabling:

• Reactive UI updates when expense data changes
• Centralized state management across the application
• Clean communication between models, viewmodels, and views

Project Structure

lib/
├── main.dart                    # App entry point with Provider setup
├── theme.dart                   # Material 3 theme configuration
├── data/
│   └── models/
│       └── expense.dart         # Expense data model with categories
├── viewmodels/
│   └── expense_viewmodel.dart   # Provider-based state management
└── views/
    ├── screens/
    │   └── expenses_screen.dart # Main screen with expense list
    └── widgets/
        ├── chart/               # Analytics chart components
        ├── expenses_list/       # Expense list and item widgets
        └── new_expense.dart     # Add/edit expense form

Visual Preview

Main Screen

The main screen provides an overview of your financial activity with expense summary and quick access to add new expenses.

Add New Expense

Intuitive form for adding expenses with category selection and input validation.

Expense List View

Comprehensive list of all expenses with detailed information and management options.

Interactive charts and analytics to visualize spending patterns and trends over time.

Development Highlights

This project showcases advanced Flutter development practices including:

• Material 3 Design System implementation for modern, accessible UI
• MVVM Architecture for maintainable, testable code structure
• Provider State Management for reactive, performant state updates
• Cross-Platform Compatibility ensuring consistent experience across platforms
• Local Data Persistence with structured data models and UUID identification
• Responsive Design adapting to various screen sizes and orientations

Bringing It All Together

This project represents a significant evolution in mobile application development, combining modern architectural patterns with beautiful design. The Expense Tracker demonstrates my ability to create production-ready applications that balance technical excellence with user experience. Whether you’re an employer seeking developers who stay current with best practices or a collaborator interested in scalable mobile solutions, this project showcases the intersection of clean architecture, modern UI design, and practical functionality that delivers real value to users.