DefInvoice – Open source billing, payment & invoicing platform

Summary: DefInvoice is an open source, self-hosted billing and invoicing platform designed to create professional invoices, manage customers, and track payments without subscription fees. It supports multiple currencies including crypto, offers a customer management flow, and provides analytics and expense tracking, all built on a modern React and Node stack.

What it does

DefInvoice enables users to generate invoices with multiple templates, handle automatic numbering, export PDFs, send invoices by email, and share public invoice links. It includes customer management, payment tracking, revenue insights, basic expense management, and supports multiple businesses within one setup.

Who it's for

It is intended for freelancers, small businesses, and developers seeking a self-hosted invoicing and billing solution without recurring subscription costs.

Why it matters

DefInvoice addresses the need for a cost-effective, flexible invoicing tool that gives users full control over their data and billing workflows without reliance on expensive SaaS platforms.