Two paragraphs.

Everything you type into StoneQR, including URLs, WiFi passwords, contact details, and uploaded logos, stays in your browser. The site has no server that receives it, no account system, and no database. Downloads are produced on your device. If you choose the optional "make it editable" hand-off, you are taken to SignUpCity, a separate product with its own privacy policy; StoneQR passes the destination in the link you click and keeps no copy.

The only measurement is Cloudflare Web Analytics, which counts page views without cookies and without reading page content. When you generate a code, the site records a single anonymous "generated" event with no payload data, so we can say how many codes were made. That is all.