Constant Contact and MailerLite are both powerful email marketing services that offer a range of features to help businesses promote their products and services to customers. Constant Contact offers a comprehensive suite of tools and templates that make it easy to create and track email campaigns, while MailerLite offers a wide range of powerful automation tools that can help automate email campaigns. Constant Contact is more feature-rich and more expensive than MailerLite, however it lacks the full range of automation tools that MailerLite offers. On the other hand, MailerLite is cheaper and more suitable for companies just getting started with email marketing, since it has an intuitive user interface and offers more automation tools. However, it does not offer as many features nor is it as comprehensive as Constant Contact. Ultimately, the difference between Constant Contact and Mailerlite depends on the size of the companys budget and the needs of their email marketing campaigns.