ConvertKit is an excellent ESP for subscription-focused businesses growing a product offering alongside their mailing list.
conversion rate optimization5 posts
KPIs are also fantastic when programming a computer or optimizing an advertising algorithm. For content analytics, however, single KPIs are a bad choice.
VWO makes the process of A/B testing website and app content fairly simple, providing easy WYSIWYG solutions for many visual website changes. Read The Content Technologist review.
RankScience is an A/B testing tool for SEO snippets and structure. Read The Content Technologist review.
RightMessage laser-focuses on doing one thing really well: customizing messaging for users who are already in your system without a login and sending their data entry to your database.