Duda

Duda is the go-to white-label builder for agencies who sell websites and landing pages to clients. You get a full funnel toolkit, including CRM, client management, team collaboration, and the ability to charge clients separately without Duda's branding appearing anywhere. Pages load fast, and the builder has enough flexibility for both simple funnels and complex multi-step flows.

It's built for agencies and resellers, not for individual course creators selling directly. The pricing and feature set assume you're building many sites and managing client relationships, which means overhead for a solo entrepreneur. If you're selling your own courses or coaching services, tools like ClickFunnels or Funnelish would be more directly useful.