Northstar Studio is sample data. Rapidco and the other live projects are early access and free.
You are looking at the public demo website for Rapidco (rapidco.de).
Northstar Studio, its people, and its client stories are invented so visitors can see layout and modules. They are not a real company.
What is real: Rapidco itself at https://rapidco.de, this demo host at https://demo.rapidco.de (CRM is read-only), and the other Accidentally Experts projects — Tennis Unlimited, Darts Unlimited, and The Helpful Travelers. All of those current projects are early access and free. Do not put real production data there yet.
Accidentally Experts (Tutzing) builds Rapidco. Their own site is https://accidentally-experts.rapidco.de.