Free Invoicing & Accounting Software for Spain

BusinessOS is a free invoicing platform for Spanish autónomos and small businesses. 21% IVA, NIF/CIF fields, EUR currency, and encrypted on-device storage. Free during limited early access.

Spanish tax compliance features

• 21% IVA standard rate, 10% reduced, 4% super-reduced
• NIF, CIF, and DNI fields
• IRPF withholding support for autónomo invoices
• EUR (€) currency formatting
• Factura format meeting AEAT requirements
• Sequential invoice numbering
• CSV export for tools like Anfix, Contasol, or Holded

Cities and regions served

BusinessOS works everywhere with an internet connection to sign up — and fully offline after that. Currency, tax, and language settings adapt to your location. Popular cities:

• Madrid
• Barcelona
• Valencia
• Sevilla
• Zaragoza
• Málaga
• Murcia
• Palma de Mallorca
• Las Palmas de Gran Canaria
• Bilbao
• Alicante
• Córdoba
• Valladolid
• Vigo
• Gijón

Built for these businesses

• Autónomos y freelancers
• Consultores y prestadores de servicios
• Agencias de marketing y estudios creativos
• E-commerce y tiendas online
• Restaurantes, cafeterías y bares
• Comercios minoristas
• Profesionales del sector inmobiliario
• Fotógrafos y creativos
• Coaches, terapeutas y formadores
• Profesionales del derecho y la medicina en solo

Complete feature set

• Unlimited invoices and quotations
• One-click quote-to-invoice conversion
• Expense tracking with receipts
• Customer CRM with pipeline and trust scoring
• Product and inventory management
• Cash flow forecasting and tax set-aside
• P&L, balance sheet, and tax reports
• Multi-currency with automatic conversion
• Voice invoicing (English + Arabic)
• One-tap WhatsApp send on every invoice
• PDF export with your branding
• Zero-knowledge encryption
• Works fully offline
• Installs as a native app on any device

Privacy first

BusinessOS stores your data with zero-knowledge encryption. Everything is encrypted on your device with AES-GCM using a key derived from your password. If our servers are ever breached, an attacker only gets encrypted noise — not your revenue figures, customer list, or bank details.