Billit macOS Invoicing App Development

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.

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

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.

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

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.

Dynamic Layout Handling for different screen sizes

Runtime Template Updates with live preview

Complete App Localization for global users

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.

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