MailerLite is a comprehensive email marketing platform, while ConvertKit offers some email marketing tools. MailerLite makes it easy to create, send, and track email campaigns, create automated sequences, and manage your subscriber lists. Additionally, it features multiple third-party integrations and personalization options. ConvertKit offers easy design and automation features, along with the ability to create custom forms and opt-ins. The tool also allows for segmentation of emails and the ability to target specific audiences. Overall, MailerLite offers more comprehensive features, but ConvertKit may be a better fit for those who prefer a streamlined email marketing experience.