Monsum is a trademark of FastBill GmbH

FastBill GmbH
Brüsseler Str. 1-3
60327 Frankfurt am Main

Represented by:
René Maudrich (Managing Director)

AG Frankfurt am Main HRB 109200
VAT ID: DE279152817

Contact Us:
Email Support here.


For an out-of-court settlement of consumer disputes, the Commission of the European Union has set up an online platform (“OS platform”), which you can turn to for out-of-court dispute resolution. You can reach the platform at: 

Our email address is: 


FreshBooks is an accounting software built for business owners and their accountants. Used by businesses in over 160 countries, FreshBooks takes an easy-to-use approach to managing finances, billing, payroll, payments, client engagement, and working with your accountant. Known for its 10x Stevie award-winning customer support, FreshBooks serves customers of all sizes from offices in Canada, Croatia, Germany, Mexico, Netherlands, and the US. FreshBooks is regularly recognized as a Top 10 employer by Great Places to Work. FreshBooks acquired FastBill and Monsum in 2021 to better support customers in Germany and throughout Europe.