Build an Invoice Generator App

Freelancers, consultants, and small businesses frequently need quick invoicing tools. Building this app teaches you form-based interfaces, PDF generation, template customization, and data export workflows—crucial in practical utility-focused app development.

The app lets users input client details, services rendered, pricing, taxes, and payment terms. It then generates a clean invoice preview and downloadable PDF, with the option to email directly from the app.

Users launch the app and fill out invoice details through a guided form. A preview is generated in real-time, which users can customize and export as a PDF. Optionally, they can save the invoice, duplicate it for future use, or email it to the client directly.

• User enters business info and uploads a logo (optional).
• Adds client name, invoice number, and due date.
• Enters line items with quantity, rate, tax, and discount.
• Sees real-time calculation of total and tax summary.
• Generates and downloads a clean PDF with one click, or sends via email.

• React Native PDFLib Guide
• jsPDF Documentation
• SendGrid Email API Setup
• Designing Printable Invoice Templates
• Firebase Authentication Guide