Privacy statement

Last updated: 19 October 2026

Vierkant is a trade name of Allions Advisory, registered with the Dutch Chamber of Commerce under number 99848376, located at IJdoornlaan, Amsterdam. Allions Advisory is the controller for personal data processed through this website.

What we process

When you request a demo, we process your email address and the language you viewed the site in. Nothing more.

Why

We only use your details to contact you about your demo request. The legal basis is your request for information and our legitimate interest in responding to it. We never add you to a newsletter without your consent.

How long

Requests that do not lead to a contract are kept for at most 12 months. If you become a customer, the retention periods of our agreement and the law apply.

Cookies and tracking

This website sets no cookies and uses no tracking. Fonts are served from our own server, not from Google. Your language preference is only remembered locally in your browser.

Who we share data with

Our website and email are hosted by Hostinger under a data processing agreement. We never sell your data.

Data inside the Vierkant service

For customers, Vierkant processes invoices and accounting data on the customer's behalf under a separate data processing agreement. This statement covers the website only.

Your rights

• Access your data
• Correct or delete it
• Object to processing
• Lodge a complaint with the Dutch Data Protection Authority (Autoriteit Persoonsgegevens)

Email us at contact@allionsadvisory.com. We respond within four weeks.