Klarbüro is invoicing and back-office software for German freelancers and small businesses: Angebote, Rechnungen and Mahnungen with XRechnung export and Kleinunternehmer (§19 UStG) support. New: a Liquidität & Controlling module with 8-week cash flow forecasts, vendor payment planning, order-level profit margins and VAT projections. Dictate documents by voice in 9 languages.