Kajabi

Kajabi combines online courses, membership communities, and newsletters into a single platform with built-in audience management. You can run newsletters for free or sell them as paid products with tier-based access, giving you multiple revenue models within one system.

Strong for creators building multiple revenue streams with their audience. If you're selling courses or running a membership, the integrated newsletter lets you message members and prospects without external tools, though the learning curve is steep for beginners.