Billit macOS Invoicing App Development
Abdullah Taha
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Posted Jan 21, 2026
Developed a native macOS app for invoicing with SwiftUI and an MVVM architecture.
Billit – Invoice Maker & Creator for macOS
Project Overview
Managing invoices and estimates efficiently is essential for freelancers, small businesses, and professionals. Billit – Invoice Maker & Creator is a fully native macOS application designed to simplify invoicing, client management, and payment tracking—delivering a smooth, powerful, and intuitive experience tailored specifically for macOS users.
The Challenge
Users needed a reliable invoicing solution that could handle complex layouts, dynamic data, and real-time previews while maintaining a polished macOS-native experience. The app needed to:
Adapt seamlessly to different macOS screen sizes
Support full invoice and estimate management
Generate professional PDFs with live previews
Offer premium templates and advanced features
Provide clear financial insights through visual data
Technical Implementation
The application was developed entirely from scratch using SwiftUI, with a strong focus on dynamic sizing and layout responsiveness across macOS devices. Built on a MVVM architecture, the app ensures clean separation of concerns, scalability, and long-term maintainability.
Core Technologies
SwiftUI – Native macOS UI with dynamic layout handling
MVVM Architecture – Clean and maintainable code structure
CoreData – Local database for storing invoices, estimates, and records
PDFKit & Image Renderer – Professional PDF generation
GeometryReader – Responsive layout and real-time preview updates
Swift Charts – Data visualization and analytics
SwiftyStoreKit – In-app purchase implementation
Key Features
1. Invoice & Estimate Management
Users can create, edit, delete, and manage invoices and estimates with full CRUD functionality.
2. Client, Business & Product Management
The app allows users to store and manage client details, business information, and product lists for quick and accurate invoicing.
3. Real-Time Template Preview
Each invoice and estimate template updates instantly as users modify values, providing a live preview experience.
4. Professional PDF Generation
Invoices and estimates can be exported as high-quality PDFs using PDFKit, with precise layout rendering.
5. Premium Templates
A selection of professionally designed templates is available, with additional premium templates unlocked via in-app purchase.
6. Digital Signature Support
Users can create and apply digital signatures directly within the app for a complete invoicing workflow.
7. Interactive Financial Insights
Dashboard graphs displaying paid, unpaid, and overdue payments for yearly overview
Monthly growth charts on invoices and estimates pages
Built using Swift Charts for smooth and clear data visualization.
8. Zoomable Template Preview
Users can zoom in and out of invoice previews for detailed review and accuracy.
Development Highlights
Fully Native macOS App
Dynamic Layout Handling for different screen sizes
Runtime Template Updates with live preview
Complete App Localization for global users
Scalable & Maintainable Codebase
Smooth Animations and Performance
Impact
Billit streamlines invoicing and financial tracking by combining professional design, real-time previews, and insightful analytics into a single macOS application. It empowers users to manage billing efficiently while maintaining a polished and professional brand presence.
Technical Specifications
Platform: macOS
Minimum OS: macOS 13.0+
Framework: SwiftUI
Architecture: MVVM
Storage: CoreData
Monetization: In-app purchases via SwiftyStoreKit
Features: Invoices, Estimates, PDF Export, Templates, Digital Signatures, Analytics