Research confirmed the problem: most s.p. owners were using Excel templates or overpriced accounting software just to issue a simple invoice. ATH INVEST needed a product that works out of the box — Slovenian language, correct tax formatting, e-invoicing support, and zero learning curve.
We built Račun123 as a focused invoicing tool that does one thing and does it well — available both as a web app and a native mobile app for iOS and Android. Users sign up, add their business details once, and start issuing professional invoices immediately. The interface is stripped down to the essentials: create invoice, add line items, send as PDF or e-invoice. Done — from your desk or on the go.
Under the hood, all Slovenian-specific requirements are handled automatically — correct VAT calculations, sequential invoice numbering that meets FURS standards, and export-ready formats for accountants. Clients can view and download their invoices through a branded portal link.
The product launched in late 2024 and is actively growing based on real user feedback. It already serves active users who collectively issue hundreds of invoices per month.
