rechnungs.tools
Free invoicing software that started as a Google Sheets add-on and grew into a flexible platform for freelancers and small teams.
The demand was always clear: freelancers need a simple way to create invoices without paying before they have revenue. Multi-client support was also important because many tools assumed a single sender profile.
The first version was a Google Sheets add-on that used sheets as the database and Google Drive as the document home. The current platform at rechnungs.tools is more flexible: multiple clients, better document handling, and support for formats such as ZUGFeRD.