Keap (Infusionsoft)

Keap (formerly Infusionsoft) is a full CRM and marketing automation platform with a dedicated WordPress plugin for capturing leads through opt-in forms. Once contacts land in Keap, you can build automated workflows, segment your audience, and run multi-step email campaigns based on customer behavior. The platform handles payments, invoicing, and sales tracking alongside marketing.

Keap fits businesses that need an all-in-one solution beyond just email marketing, from small service providers to growing e-commerce stores. While it's pricier than form-only plugins, you get full customer relationship management and advanced automation that makes scaling operations much easier.