Business & CRM

Invoice & Billing App

Build an invoicing app to create, send, and track invoices with recurring billing and payment tracking.

Build an invoice and billing application:

Invoice creation:
- Create professional invoices with line items, quantities, rates, tax, and discounts
- Customizable invoice template with your logo and business info
- Auto-increment invoice numbers
- Add payment terms and due dates
- Support multiple currencies

Client management:
- Client profiles with billing address, email, and payment terms
- View all invoices per client
- Outstanding balance per client

Recurring billing:
- Set up recurring invoices (weekly, monthly, quarterly, annually)
- Auto-generate and optionally auto-send on schedule
- Pause or cancel recurring invoices

Payment tracking:
- Mark invoices as paid, partially paid, or overdue
- Record payment date and method
- Send payment reminders for overdue invoices
- Export invoices as PDF

Dashboard:
- Revenue overview: invoiced, collected, outstanding
- Overdue invoice alerts
- Monthly revenue trends

The app should have user authentication.

Visual style:
- Color palette: clean white with dark teal (#0F766E) primary and subtle gray borders for invoice structure
- Document-style layout for invoices with structured line items and totals
- Professional serif for invoice headings, sans-serif for UI — business-document feel
- Elegant financial aesthetic — crisp, trustworthy, print-ready appearance

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