Smart, user-friendly invoicing and time registration software We have thousands of enthusiastic customers, and we are proud of that! Invoicing Office is a all-in-one invoicing and time tracking solution for small companies and freelancers. The software is build so you can do your accounting effortlessly. With the focus on entrepreneurship, all features are designed to save you time and money. That way you can fully focus on growing your business and don't waste time on accounting.