ConvertKit is a powerful email marketing platform designed to help entrepreneurs grow their online business. It has simpler, drag-and-drop tools, detailed analytics, and a focus on automating sales, opt-in forms, and newsletters. It also emphasizes sending targeted emails, integrating with other marketing tools, and providing customers with a unified customer experience. Mailshake is an automated email marketing solution that includes features such as email tracking and follow-up sequences. It was designed to simplify email outreach and to increase response rates. It comes with more advanced email personalization options, extensive customization options, and more sophisticated automation rules. It also has less automation features, a smaller library of opt-in forms and templates, and less detailed analytics. However, there is a log of customization with Mailshake and it allows businesses to automate many more follow-up emails.