Orfeo Autónomo: facturación VeriFactu: Facturas VeriFactu desde el móvil, sin servidor propio

Hi everyone! I'm a solo developer and self-employed (autónomo) in Spain. From July 2027, all self-employed workers here will be legally required to use VeriFactu-compliant invoicing software. I didn't like the existing options — either you depend on a gestoría (accounting agency), or you pay for a SaaS that stores your invoices on someone else's server. So I built Orfeo Autónomo: you register client, concept and amount from your phone, and the app generates the invoice record (chained hash + VeriFactu QR code), signs it with your digital certificate, and sends it directly to the Spanish Tax Agency — no server of mine in between. It also handles quotes, expense tracking via receipt photos, and quarterly VAT summaries. Free until July 31, 2027, then 29.99€/year. Happy to answer any questions, especially technical ones about the VeriFactu spec if anyone's curious!