About us

Who operates the service

The application is run by a Czech limited liability company entered in the commercial register. Everything below can be verified against the public ARES registry by company number.

Registered name

Sirius Cybernetics Corporation s.r.o.

Registered seat

Doudlebská 1312/4, 140 00 Praha 4, Česká republika

Company number (IČO)

24564770

Commercial register entry

Sp. zn. C 443390 vedená u Městského soudu v Praze

VAT number

Not VAT-registered

What the application does

Every item below can be checked without registering or talking to anyone.

• Invoices can be issued by hand, on a recurring schedule, or described in a sentence and drafted by the AI assistant. You can try that for free in the AI invoice tool.
• Control statements, VAT returns, EU summary reports and personal or corporate income tax returns are produced as XML for the DIS+ portal.
• The application connects to 30 external systems — e-shops, CRMs, banks, payment gateways and accounting software. Every connection has its own page describing how it works: the integrations overview.
• Invoices, contacts, expenses, payments and products are reachable through the public REST API and through MCP, the protocol that connects the app to Claude or ChatGPT: API documentation.
• The free plan is not a time-limited trial — it stays free indefinitely, with a monthly invoice limit. Prices and limits for every plan are on the Pricing page.

How we handle your data

The server infrastructure is operated inside the EU. The full list of processors, the legal grounds we rely on, and how to export or erase your data are set out in our Privacy Policy.

We do not paper over availability with a marketing number. The live check of the application and the database is published on the Service status page.

How to reach us

We answer by e-mail, in person rather than from a template. Support: podpora@fakturujsi.cz. All contact and identification details.