Factusync

Factusync is a modern desktop app for Spanish invoicing and lightweight ERP, built for small businesses and self-employed professionals who want something fast, simple and compliant.

What it is

A cross-platform desktop application for Windows and macOS with a local-first, hybrid-SaaS model: your data lives on your own machine, while a VPS backend handles licensing, backups and sync.

Highlights

  • Spanish invoicing (facturación) and basic ERP for autónomos and small businesses
  • Local-first desktop app for Windows and macOS
  • Hybrid SaaS: a VPS for licensing, backups and backend services
  • Commercial website with an online store and Stripe payments
  • Community forum at foro.factusync.es

Status

In active development — 2026.

Visit factusync.es

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Commonly asked questions and answers

WhatsApp:
wa.link/j4hvga
Email:
carlos@agorreta.eu
What does working with you on a project look like?
Every project starts with understanding your goal, your users and your constraints. From there I handle design, development and delivery myself - whether that is a website, a PCB or the firmware in between - and keep you involved at each milestone.
Mostly small businesses, founders and startups. I like projects where I can work directly with the person behind the idea and move fast, without unnecessary bureaucracy.
Yes. Alongside web and software work I design custom electronics and embedded systems - PCBs, IoT devices and ESP32/STM32 firmware - from a first prototype to production-ready hardware.
On the web: WordPress and custom code, with WooCommerce and Stripe for e-commerce. On hardware: schematic and PCB design, ESP32 and STM32 firmware, SPI/I2C interfacing, and lab-grade validation.
Yes. I stay involved after launch for updates, fixes and improvements - and for hardware, for revisions and scaling to production. You will not be left on your own.

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