From Privacy Policy

"aQuest app, as well as aQuest website is a product of Enkronos d.o.o. company, Cesta Zore Perrello-Godina 2, Si6000 Koper-Capodistria, Slovenija."

By the way, they have an error in the Privacy Policy. "https://aquest.com", but the correct version is "https://aquest.IO"