Concepts
Platform providers
Understand what adapters normalize and what remains provider-specific.
A provider adapter translates one platform's API into the DomainProvider contract. Changing adapters keeps your application lifecycle stable, but it does not erase platform limitations or migrate live traffic.
Vercel scopes domains to a project. Cloudflare uses Custom Hostnames inside a SaaS zone. Railway scopes custom domains to a project, environment, and service. Render scopes domains to a web service or static site. Netlify manages additional customer domains as site aliases while preserving the primary domain. The memory provider is isolated, deterministic test infrastructure.
Read next: Provider overview.