We use www.example.com, app.example.com, and docs.example.com. Can a visitor make one choice instead of seeing the Consent banner on every subdomain?
Business and Enterprise projects can share the optinstack consent cookie across subdomains of the same registrable site domain. Each subdomain should use the same OptinStack project configuration and HTTPS when secure cookies are enabled.
Browser cookies cannot be shared across unrelated domains such as example.com and example.net. Preview hostnames on Webflow, Framer, or other unrelated platform domains also do not share browser consent with your production domain.
Documentation: Cross-subdomain consent sharing and Domain Scans: staging and production.