Deltra is a software company that specializes in financial and business management solutions. Their prominent product, as indicated by their website http://invoiz.de, appears to focus on invoicing and related financial services, catering primarily to small and medium-sized businesses seeking streamlined and efficient tools for managing their transactions, billing, and financial records. Deltra aims to simplify the complexities of financial operations with user-friendly interfaces and features that enhance productivity and ensure compliance with relevant financial regulations. Deltra's solution likely includes capabilities such as generating invoices, tracking payments, and possibly providing analytics to help businesses manage their financial health more effectively.