subdomain.to is a cloud computing platform that lets SaaS companies offer custom, customer-owned domains without building or operating the underlying DNS, certificate, and routing infrastructure. The service packages the operational burden of custom domains into a single integration, making it ideal for startups, engineers, and product managers who want to boost productivity.

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 to configure, monitors verification, automatically issues and renews TLS certificates, and securely routes HTTPS traffic to the application.

Key features include automated DNS verification with a guided customer setup widget, managed TLS certificate lifecycles, and secure HTTPS routing. Developers can manage the entire process through SDKs, status APIs, and signed webhooks while keeping the original host information for tenant resolution.