Invoice Ninja

The software provides a web‑based system for creating and managing invoices, quotes, expenses, and tasks. It runs on a Laravel backend with a React front‑end and offers mobile and desktop clients built with Flutter, allowing users to work from browsers, iOS, Android, macOS, Windows, and Linux. Core functionality includes generating invoices, tracking payments, and organizing related financial data, all accessible through a self‑hosted installation or a hosted SaaS option.

It targets freelancers, small businesses, and teams that need an open‑source solution for billing and expense management without a mandatory subscription. The code is released under the Elastic‑2.0 license, and a free tier is available for self‑hosting; a paid white‑label license can remove branding. Documentation, API references, and SDKs such as a Go client are provided to support integration and custom development.

Distinctive aspects include the ability to run the full feature set on the user’s own server, support for multiple deployment methods (Docker, Cloudron, Softaculous, etc.), and a suite of client applications that sync with the same backend. The project is marked as stable, with continuous integration testing and community support channels including forums, Slack, and Discord.