subdomain.to is a cloud computing platform that lets SaaS companies offer customer-owned domains without operating the complex DNS, certificate, and routing infrastructure themselves. Designed for startups, engineers, and product managers, the platform packages the operational burden of custom domain management behind a single integration. It replaces the need to build in-house verification systems, TLS issuance, and secure host routing. The platform works by creating an HTTPS destination and adding customer domains through an API or dashboard. subdomain.to then returns the exact DNS record for the customer, monitors verification, issues and renews TLS certificates, and activates secure routing. Your application retains the original host information for tenant resolution, while status APIs and signed webhooks expose every stage of the lifecycle. Key features include automated DNS verification with a guided customer setup widget, fully managed TLS certificate lifecycles, and secure HTTPS routing. By handling the retries, state management, and support tooling, it boosts productivity for product teams.