KLInvoice is one of my side projects and completely Open-Source. It’s released under the MIT License.

Here are some of the main features:

  • Built using Java, Spring, AngularJS
  • PDF generation using LaTeX
  • Integrated PDF Viewer (with Mozilla PDF.js)
  • Templates for Email & Invoices
  • Recurring invoices (*)
  • File Attachments (*)
  • Multi-language/multi-user/multi-company support
  • Tax rates and payment terms (*)
  • Reminder emails (*)
  • Partial payments (*)
  • Social Login

* This software is currently under heavy development. I appreciate every feedback to make it better.


Checkout my GitHub repository for more informations and for download the source files. https://github.com/KardungLa/klinvoice

During the next couple of weeks, I’m planning to get a hosted cloud version running. It will be completely free of charge for Freelancers and Small Businesses.