Split-Lah is a mobile application designed to make bill splitting effortless, inspired by Singapore's unique "lah" expression. Our app simplifies expense tracking and debt settlement among friends, families, and groups.
- Group Management: Create permanent groups for recurring expenses with friends, family, or colleagues
- Multi-Currency Support: Handle expenses in different currencies
- Smart Debt Simplification: Optimized debt paths to minimize the number of transactions needed to settle debts
- Real-time Updates: Instant notifications when transactions are recorded or debts are settled
- Expense Categories: Categorize expenses (food, entertainment, transport, etc.) for better tracking
- Expense History: View transaction history with detailed information
- User Profiles: Personalized profiles with customizable icons
Our project poster provides an overview of Split-Lah's key features and design philosophy:
Our project video provides an overview idea of Split-Lah's key features:
Before development, we created a comprehensive prototype to refine our UI/UX design:
View our complete Figma design file to see our design process, component library, and user flow mapping.
Key design principles:
- Clean, intuitive interface prioritizing quick bill entry
- Clear visualization of debts and settlements
- Consistent visual language with Singapore-inspired elements
- Accessibility considerations for diverse users
- Frontend: Java, Android SDK
- Backend: Firebase Firestore
- Authentication: Firebase Authentication
- UI Components: Material Design
- Real-time Communication: Firebase Cloud Messaging
- Android Studio
- Firebase account
- Java Development Kit (JDK) 11 or higher
- Clone the repository
git clone https://github.com/your-username/split-lah.git - Open the project in Android Studio
- Connect your Firebase project:
- Add
google-services.jsonto the app directory - Enable Authentication and Firestore in Firebase Console
- Build and run the app on an emulator or physical device
app/
├── src/
│ ├── main/
│ │ ├── java/com/example/split_lah/
│ │ │ ├── models/ # Data models
│ │ │ │ ├── TransactionLine.java
│ │ │ │ ├── User.java
│ │ │ │ └── IconUtils.java
│ │ │ ├── ui/ # UI components
│ │ │ │ ├── home/ # Home screen components
│ │ │ │ ├── split/ # Bill splitting functionality
│ │ │ │ ├── debt_relation/ # Debt relations management
│ │ │ │ ├── records/ # Transaction records
│ │ │ │ ├── net_balances/ # Net balances visualization
│ │ │ │ └── members/ # Group members management
│ │ │ ├── shared_view_model/ # Shared data between fragments
│ │ │ ├── utils/ # Utility classes
│ │ │ └── MainActivity.java # Main activity & navigation
│ │ ├── res/ # Resources
│ │ │ ├── layout/ # UI layouts
│ │ │ ├── drawable/ # Icons and images
│ │ │ ├── values/ # Strings, colors, styles
│ │ │ └── navigation/ # Navigation graphs
│ │ └── AndroidManifest.xml # App configuration
│ └── test/ # Unit tests
├── build.gradle # Project build configuration
└── google-services.json # Firebase configuration
The structure shows how we've organized the app into logical components:
- Separated UI by feature (home, split, debt relations, etc.)
- Clear model definitions for data handling
- Shared ViewModel architecture for state management
- Resource organization following Android best practices
- Implement OCR for receipt scanning
- Add integration with payment systems
- Develop iOS version
- Enable expense analytics and reporting
- Add support for recurring expenses
This project is licensed under the MIT License - see the LICENSE file for details.
- Inspired by the Singaporean culture and "lah" expression
- Thanks to SUTD for supporting this project
- Special thanks to Mithun Mohan K for his article Algorithm Behind Splitwise's Debt Simplification Feature, which we use for our debt simplification implementation
- The debt simplification algorithm in our app is based on Mithun's work on simplifying IOUs between multiple people
- Additional thanks to:
- Firebase for their excellent backend services
- Material Design for UI guidelines
- Android development community for their valuable resources