You finished the work. The invoice is still unsent. Invox builds the estimate PDF, converts it to an invoice, adds a working payment link and sends the reminders that chase it. The reminders stop the moment someone pays.

Payment links work through Stripe, PayPal, Square, your own payment page or plain bank transfer instructions.

Through Stripe you also accept Apple Pay, Google Pay, Amazon Pay and Cash App Pay with no extra accounts. Reminders send by email or text through your choice of provider.
Everything runs on your machine. Your customer list never leaves it.

You receive the full Python source code, customizable PDF templates, a local database, an estimate builder spreadsheet, complete documentation, sample data and 111 automated tests you can run yourself. Thirty six of those check only the money, so the payment link asks for the invoice total including tax, never the subtotal and never twice.

One payment. No subscription. Single use license for one business. Client work requires the Commercial License. Not affiliated with Stripe, PayPal or Square.